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Finding the Fourth Proportional to 718,254.50, 991,165.68 and 391,560.74

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Solution

The fourth proportional to 718,254.50, 991,165.68 and 391,560.74 is: 540,339.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,254.50 : 991,165.68 = 391,560.74 : x
  2. Step 2: Convert to fraction form
    718,254.50/991,165.68 = 391,560.74/x
  3. Step 3: Cross multiply
    718,254.50x = 991,165.68 × 391,560.74
  4. Step 4: Simplify right side
    718,254.50x = 388,101,567,123.40
  5. Step 5: Solve for x
    x = 388,101,567,123.40/718,254.50
  6. Step 6: Final answer
    x = 540,339.90

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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.