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Finding the Fourth Proportional to 66.24, 91.28 and 61.84

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Solution

The fourth proportional to 66.24, 91.28 and 61.84 is: 85.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.24 : 91.28 = 61.84 : x
  2. Step 2: Convert to fraction form
    66.24/91.28 = 61.84/x
  3. Step 3: Cross multiply
    66.24x = 91.28 × 61.84
  4. Step 4: Simplify right side
    66.24x = 5,644.76
  5. Step 5: Solve for x
    x = 5,644.76/66.24
  6. Step 6: Final answer
    x = 85.22

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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.