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Finding the Fourth Proportional to 47.89, 71.52 and 42.06

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Solution

The fourth proportional to 47.89, 71.52 and 42.06 is: 62.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.89 : 71.52 = 42.06 : x
  2. Step 2: Convert to fraction form
    47.89/71.52 = 42.06/x
  3. Step 3: Cross multiply
    47.89x = 71.52 × 42.06
  4. Step 4: Simplify right side
    47.89x = 3,007.92
  5. Step 5: Solve for x
    x = 3,007.92/47.89
  6. Step 6: Final answer
    x = 62.81

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.