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Finding the Fourth Proportional to 61.76, 84.96 and 54.87

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Solution

The fourth proportional to 61.76, 84.96 and 54.87 is: 75.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.76 : 84.96 = 54.87 : x
  2. Step 2: Convert to fraction form
    61.76/84.96 = 54.87/x
  3. Step 3: Cross multiply
    61.76x = 84.96 × 54.87
  4. Step 4: Simplify right side
    61.76x = 4,661.76
  5. Step 5: Solve for x
    x = 4,661.76/61.76
  6. Step 6: Final answer
    x = 75.49

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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.