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Finding the Fourth Proportional to 1,042.97, 1,439.29 and 570.86

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Solution

The fourth proportional to 1,042.97, 1,439.29 and 570.86 is: 787.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.97 : 1,439.29 = 570.86 : x
  2. Step 2: Convert to fraction form
    1,042.97/1,439.29 = 570.86/x
  3. Step 3: Cross multiply
    1,042.97x = 1,439.29 × 570.86
  4. Step 4: Simplify right side
    1,042.97x = 821,635.26
  5. Step 5: Solve for x
    x = 821,635.26/1,042.97
  6. Step 6: Final answer
    x = 787.79

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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.