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Finding the Fourth Proportional to 1,042.12, 1,562.91 and 392.86

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Solution

The fourth proportional to 1,042.12, 1,562.91 and 392.86 is: 589.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.12 : 1,562.91 = 392.86 : x
  2. Step 2: Convert to fraction form
    1,042.12/1,562.91 = 392.86/x
  3. Step 3: Cross multiply
    1,042.12x = 1,562.91 × 392.86
  4. Step 4: Simplify right side
    1,042.12x = 614,004.82
  5. Step 5: Solve for x
    x = 614,004.82/1,042.12
  6. Step 6: Final answer
    x = 589.19

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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.