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Finding the Fourth Proportional to 97.64, 146.55 and 66.70

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Solution

The fourth proportional to 97.64, 146.55 and 66.70 is: 100.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.64 : 146.55 = 66.70 : x
  2. Step 2: Convert to fraction form
    97.64/146.55 = 66.70/x
  3. Step 3: Cross multiply
    97.64x = 146.55 × 66.70
  4. Step 4: Simplify right side
    97.64x = 9,774.15
  5. Step 5: Solve for x
    x = 9,774.15/97.64
  6. Step 6: Final answer
    x = 100.10

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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.