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Finding the Fourth Proportional to 88.32, 131.72 and 85.68

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Solution

The fourth proportional to 88.32, 131.72 and 85.68 is: 127.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.32 : 131.72 = 85.68 : x
  2. Step 2: Convert to fraction form
    88.32/131.72 = 85.68/x
  3. Step 3: Cross multiply
    88.32x = 131.72 × 85.68
  4. Step 4: Simplify right side
    88.32x = 11,285.77
  5. Step 5: Solve for x
    x = 11,285.77/88.32
  6. Step 6: Final answer
    x = 127.78

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.