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Finding the Fourth Proportional to 61.89, 85.17 and 54.06

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Solution

The fourth proportional to 61.89, 85.17 and 54.06 is: 74.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.89 : 85.17 = 54.06 : x
  2. Step 2: Convert to fraction form
    61.89/85.17 = 54.06/x
  3. Step 3: Cross multiply
    61.89x = 85.17 × 54.06
  4. Step 4: Simplify right side
    61.89x = 4,604.29
  5. Step 5: Solve for x
    x = 4,604.29/61.89
  6. Step 6: Final answer
    x = 74.39

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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.