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Finding the Fourth Proportional to 865.61, 1,298.39 and 249.32

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Solution

The fourth proportional to 865.61, 1,298.39 and 249.32 is: 373.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.61 : 1,298.39 = 249.32 : x
  2. Step 2: Convert to fraction form
    865.61/1,298.39 = 249.32/x
  3. Step 3: Cross multiply
    865.61x = 1,298.39 × 249.32
  4. Step 4: Simplify right side
    865.61x = 323,706.86
  5. Step 5: Solve for x
    x = 323,706.86/865.61
  6. Step 6: Final answer
    x = 373.97

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Double scale
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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.