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Finding the Fourth Proportional to 718,754.10, 991,887.58 and 396,477.78

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Solution

The fourth proportional to 718,754.10, 991,887.58 and 396,477.78 is: 547,143.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,754.10 : 991,887.58 = 396,477.78 : x
  2. Step 2: Convert to fraction form
    718,754.10/991,887.58 = 396,477.78/x
  3. Step 3: Cross multiply
    718,754.10x = 991,887.58 × 396,477.78
  4. Step 4: Simplify right side
    718,754.10x = 393,261,385,727.97
  5. Step 5: Solve for x
    x = 393,261,385,727.97/718,754.10
  6. Step 6: Final answer
    x = 547,143.15

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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.