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Finding the Fourth Proportional to 47.74, 71.64 and 39.16

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Solution

The fourth proportional to 47.74, 71.64 and 39.16 is: 58.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.74 : 71.64 = 39.16 : x
  2. Step 2: Convert to fraction form
    47.74/71.64 = 39.16/x
  3. Step 3: Cross multiply
    47.74x = 71.64 × 39.16
  4. Step 4: Simplify right side
    47.74x = 2,805.42
  5. Step 5: Solve for x
    x = 2,805.42/47.74
  6. Step 6: Final answer
    x = 58.76

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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.