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Finding the Fourth Proportional to 689,642.13, 951,691.22 and 399,265.94

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Solution

The fourth proportional to 689,642.13, 951,691.22 and 399,265.94 is: 550,978.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    689,642.13 : 951,691.22 = 399,265.94 : x
  2. Step 2: Convert to fraction form
    689,642.13/951,691.22 = 399,265.94/x
  3. Step 3: Cross multiply
    689,642.13x = 951,691.22 × 399,265.94
  4. Step 4: Simplify right side
    689,642.13x = 379,977,889,543.05
  5. Step 5: Solve for x
    x = 379,977,889,543.05/689,642.13
  6. Step 6: Final answer
    x = 550,978.36

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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.