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Finding the Fourth Proportional to 1,042.29, 1,560.74 and 825.21

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Solution

The fourth proportional to 1,042.29, 1,560.74 and 825.21 is: 1,235.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.29 : 1,560.74 = 825.21 : x
  2. Step 2: Convert to fraction form
    1,042.29/1,560.74 = 825.21/x
  3. Step 3: Cross multiply
    1,042.29x = 1,560.74 × 825.21
  4. Step 4: Simplify right side
    1,042.29x = 1,287,934.13
  5. Step 5: Solve for x
    x = 1,287,934.13/1,042.29
  6. Step 6: Final answer
    x = 1,235.68

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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.