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Finding the Fourth Proportional to 717,488.36, 990,133.82 and 395,198.45

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Solution

The fourth proportional to 717,488.36, 990,133.82 and 395,198.45 is: 545,373.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,488.36 : 990,133.82 = 395,198.45 : x
  2. Step 2: Convert to fraction form
    717,488.36/990,133.82 = 395,198.45/x
  3. Step 3: Cross multiply
    717,488.36x = 990,133.82 × 395,198.45
  4. Step 4: Simplify right side
    717,488.36x = 391,299,350,956.58
  5. Step 5: Solve for x
    x = 391,299,350,956.58/717,488.36
  6. Step 6: Final answer
    x = 545,373.80

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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.