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Finding the Fourth Proportional to 66.78, 100.24 and 64.18

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Solution

The fourth proportional to 66.78, 100.24 and 64.18 is: 96.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.78 : 100.24 = 64.18 : x
  2. Step 2: Convert to fraction form
    66.78/100.24 = 64.18/x
  3. Step 3: Cross multiply
    66.78x = 100.24 × 64.18
  4. Step 4: Simplify right side
    66.78x = 6,433.08
  5. Step 5: Solve for x
    x = 6,433.08/66.78
  6. Step 6: Final answer
    x = 96.34

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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.