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Finding the Fourth Proportional to 717,900.55, 990,700.69 and 395,610.55

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Solution

The fourth proportional to 717,900.55, 990,700.69 and 395,610.55 is: 545,941.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,900.55 : 990,700.69 = 395,610.55 : x
  2. Step 2: Convert to fraction form
    717,900.55/990,700.69 = 395,610.55/x
  3. Step 3: Cross multiply
    717,900.55x = 990,700.69 × 395,610.55
  4. Step 4: Simplify right side
    717,900.55x = 391,931,644,856.28
  5. Step 5: Solve for x
    x = 391,931,644,856.28/717,900.55
  6. Step 6: Final answer
    x = 545,941.42

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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.