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Finding the Fourth Proportional to 39.72, 59.56 and 12.66

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Solution

The fourth proportional to 39.72, 59.56 and 12.66 is: 18.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.72 : 59.56 = 12.66 : x
  2. Step 2: Convert to fraction form
    39.72/59.56 = 12.66/x
  3. Step 3: Cross multiply
    39.72x = 59.56 × 12.66
  4. Step 4: Simplify right side
    39.72x = 753.81
  5. Step 5: Solve for x
    x = 753.81/39.72
  6. Step 6: Final answer
    x = 18.98

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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.