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Finding the Fourth Proportional to 66.50, 98.72 and 65.42

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Solution

The fourth proportional to 66.50, 98.72 and 65.42 is: 97.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.50 : 98.72 = 65.42 : x
  2. Step 2: Convert to fraction form
    66.50/98.72 = 65.42/x
  3. Step 3: Cross multiply
    66.50x = 98.72 × 65.42
  4. Step 4: Simplify right side
    66.50x = 6,458.26
  5. Step 5: Solve for x
    x = 6,458.26/66.50
  6. Step 6: Final answer
    x = 97.12

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.