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Finding the Fourth Proportional to 88.16, 131.90 and 84.78

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Solution

The fourth proportional to 88.16, 131.90 and 84.78 is: 126.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.16 : 131.90 = 84.78 : x
  2. Step 2: Convert to fraction form
    88.16/131.90 = 84.78/x
  3. Step 3: Cross multiply
    88.16x = 131.90 × 84.78
  4. Step 4: Simplify right side
    88.16x = 11,182.06
  5. Step 5: Solve for x
    x = 11,182.06/88.16
  6. Step 6: Final answer
    x = 126.85

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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.