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Finding the Fourth Proportional to 47.88, 71.52 and 39.84

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Solution

The fourth proportional to 47.88, 71.52 and 39.84 is: 59.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.88 : 71.52 = 39.84 : x
  2. Step 2: Convert to fraction form
    47.88/71.52 = 39.84/x
  3. Step 3: Cross multiply
    47.88x = 71.52 × 39.84
  4. Step 4: Simplify right side
    47.88x = 2,849.36
  5. Step 5: Solve for x
    x = 2,849.36/47.88
  6. Step 6: Final answer
    x = 59.51

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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.