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Finding the Fourth Proportional to 285,310.62, 428,037 and 85,634.70

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Solution

The fourth proportional to 285,310.62, 428,037 and 85,634.70 is: 128,473.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,310.62 : 428,037 = 85,634.70 : x
  2. Step 2: Convert to fraction form
    285,310.62/428,037 = 85,634.70/x
  3. Step 3: Cross multiply
    285,310.62x = 428,037 × 85,634.70
  4. Step 4: Simplify right side
    285,310.62x = 36,654,820,083.90
  5. Step 5: Solve for x
    x = 36,654,820,083.90/285,310.62
  6. Step 6: Final answer
    x = 128,473.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.