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Finding the Fourth Proportional to 718,561.60, 991,622.08 and 396,284.80

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Solution

The fourth proportional to 718,561.60, 991,622.08 and 396,284.80 is: 546,876.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,561.60 : 991,622.08 = 396,284.80 : x
  2. Step 2: Convert to fraction form
    718,561.60/991,622.08 = 396,284.80/x
  3. Step 3: Cross multiply
    718,561.60x = 991,622.08 × 396,284.80
  4. Step 4: Simplify right side
    718,561.60x = 392,964,757,648.38
  5. Step 5: Solve for x
    x = 392,964,757,648.38/718,561.60
  6. Step 6: Final answer
    x = 546,876.92

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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.