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Finding the Fourth Proportional to 865.62, 1,298.34 and 542.43

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Solution

The fourth proportional to 865.62, 1,298.34 and 542.43 is: 813.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.62 : 1,298.34 = 542.43 : x
  2. Step 2: Convert to fraction form
    865.62/1,298.34 = 542.43/x
  3. Step 3: Cross multiply
    865.62x = 1,298.34 × 542.43
  4. Step 4: Simplify right side
    865.62x = 704,258.57
  5. Step 5: Solve for x
    x = 704,258.57/865.62
  6. Step 6: Final answer
    x = 813.59

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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.