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Finding the Fourth Proportional to 717,425.56, 990,053.85 and 395,136.82

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Solution

The fourth proportional to 717,425.56, 990,053.85 and 395,136.82 is: 545,292.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,425.56 : 990,053.85 = 395,136.82 : x
  2. Step 2: Convert to fraction form
    717,425.56/990,053.85 = 395,136.82/x
  3. Step 3: Cross multiply
    717,425.56x = 990,053.85 × 395,136.82
  4. Step 4: Simplify right side
    717,425.56x = 391,206,729,917.76
  5. Step 5: Solve for x
    x = 391,206,729,917.76/717,425.56
  6. Step 6: Final answer
    x = 545,292.43

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.