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Finding the Fourth Proportional to 64.89, 97.20 and 54.66

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Solution

The fourth proportional to 64.89, 97.20 and 54.66 is: 81.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.89 : 97.20 = 54.66 : x
  2. Step 2: Convert to fraction form
    64.89/97.20 = 54.66/x
  3. Step 3: Cross multiply
    64.89x = 97.20 × 54.66
  4. Step 4: Simplify right side
    64.89x = 5,312.95
  5. Step 5: Solve for x
    x = 5,312.95/64.89
  6. Step 6: Final answer
    x = 81.88

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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.