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Finding the Fourth Proportional to 283,398.90, 391,087.89 and 156,071.76

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Solution

The fourth proportional to 283,398.90, 391,087.89 and 156,071.76 is: 215,377.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    283,398.90 : 391,087.89 = 156,071.76 : x
  2. Step 2: Convert to fraction form
    283,398.90/391,087.89 = 156,071.76/x
  3. Step 3: Cross multiply
    283,398.90x = 391,087.89 × 156,071.76
  4. Step 4: Simplify right side
    283,398.90x = 61,037,775,306.99
  5. Step 5: Solve for x
    x = 61,037,775,306.99/283,398.90
  6. Step 6: Final answer
    x = 215,377.60

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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.