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Finding the Fourth Proportional to 67.92, 93.76 and 47.20

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Solution

The fourth proportional to 67.92, 93.76 and 47.20 is: 65.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.92 : 93.76 = 47.20 : x
  2. Step 2: Convert to fraction form
    67.92/93.76 = 47.20/x
  3. Step 3: Cross multiply
    67.92x = 93.76 × 47.20
  4. Step 4: Simplify right side
    67.92x = 4,425.47
  5. Step 5: Solve for x
    x = 4,425.47/67.92
  6. Step 6: Final answer
    x = 65.16

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.