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Finding the Fourth Proportional to 62.61, 86.40 and 40.47

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Solution

The fourth proportional to 62.61, 86.40 and 40.47 is: 55.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.61 : 86.40 = 40.47 : x
  2. Step 2: Convert to fraction form
    62.61/86.40 = 40.47/x
  3. Step 3: Cross multiply
    62.61x = 86.40 × 40.47
  4. Step 4: Simplify right side
    62.61x = 3,496.61
  5. Step 5: Solve for x
    x = 3,496.61/62.61
  6. Step 6: Final answer
    x = 55.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.