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Finding the Fourth Proportional to 55.92, 77.38 and 47.72

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Solution

The fourth proportional to 55.92, 77.38 and 47.72 is: 66.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.92 : 77.38 = 47.72 : x
  2. Step 2: Convert to fraction form
    55.92/77.38 = 47.72/x
  3. Step 3: Cross multiply
    55.92x = 77.38 × 47.72
  4. Step 4: Simplify right side
    55.92x = 3,692.57
  5. Step 5: Solve for x
    x = 3,692.57/55.92
  6. Step 6: Final answer
    x = 66.03

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Why These Related Problems?

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