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Finding the Fourth Proportional to 47.68, 71.40 and 43.92

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Solution

The fourth proportional to 47.68, 71.40 and 43.92 is: 65.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.68 : 71.40 = 43.92 : x
  2. Step 2: Convert to fraction form
    47.68/71.40 = 43.92/x
  3. Step 3: Cross multiply
    47.68x = 71.40 × 43.92
  4. Step 4: Simplify right side
    47.68x = 3,135.89
  5. Step 5: Solve for x
    x = 3,135.89/47.68
  6. Step 6: Final answer
    x = 65.77

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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.