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Finding the Fourth Proportional to 282.61, 424.05 and 138.25

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Solution

The fourth proportional to 282.61, 424.05 and 138.25 is: 207.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.61 : 424.05 = 138.25 : x
  2. Step 2: Convert to fraction form
    282.61/424.05 = 138.25/x
  3. Step 3: Cross multiply
    282.61x = 424.05 × 138.25
  4. Step 4: Simplify right side
    282.61x = 58,624.91
  5. Step 5: Solve for x
    x = 58,624.91/282.61
  6. Step 6: Final answer
    x = 207.44

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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.