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Finding the Fourth Proportional to 97.64, 146.62 and 85.72

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Solution

The fourth proportional to 97.64, 146.62 and 85.72 is: 128.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.64 : 146.62 = 85.72 : x
  2. Step 2: Convert to fraction form
    97.64/146.62 = 85.72/x
  3. Step 3: Cross multiply
    97.64x = 146.62 × 85.72
  4. Step 4: Simplify right side
    97.64x = 12,568.27
  5. Step 5: Solve for x
    x = 12,568.27/97.64
  6. Step 6: Final answer
    x = 128.72

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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.