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Finding the Fourth Proportional to 717,870.38, 990,656.87 and 391,182.80

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Solution

The fourth proportional to 717,870.38, 990,656.87 and 391,182.80 is: 539,829.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,870.38 : 990,656.87 = 391,182.80 : x
  2. Step 2: Convert to fraction form
    717,870.38/990,656.87 = 391,182.80/x
  3. Step 3: Cross multiply
    717,870.38x = 990,656.87 × 391,182.80
  4. Step 4: Simplify right side
    717,870.38x = 387,527,921,336.64
  5. Step 5: Solve for x
    x = 387,527,921,336.64/717,870.38
  6. Step 6: Final answer
    x = 539,829.94

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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.