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Finding the Fourth Proportional to 40.61, 61.14 and 39.66

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Solution

The fourth proportional to 40.61, 61.14 and 39.66 is: 59.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.61 : 61.14 = 39.66 : x
  2. Step 2: Convert to fraction form
    40.61/61.14 = 39.66/x
  3. Step 3: Cross multiply
    40.61x = 61.14 × 39.66
  4. Step 4: Simplify right side
    40.61x = 2,424.81
  5. Step 5: Solve for x
    x = 2,424.81/40.61
  6. Step 6: Final answer
    x = 59.72

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.