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Finding the Fourth Proportional to 1,010.57, 1,394.46 and 715.92

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Solution

The fourth proportional to 1,010.57, 1,394.46 and 715.92 is: 987.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,010.57 : 1,394.46 = 715.92 : x
  2. Step 2: Convert to fraction form
    1,010.57/1,394.46 = 715.92/x
  3. Step 3: Cross multiply
    1,010.57x = 1,394.46 × 715.92
  4. Step 4: Simplify right side
    1,010.57x = 998,321.80
  5. Step 5: Solve for x
    x = 998,321.80/1,010.57
  6. Step 6: Final answer
    x = 987.88

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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.