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Finding the Fourth Proportional to 84.32, 115.88 and 71.36

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Solution

The fourth proportional to 84.32, 115.88 and 71.36 is: 98.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.32 : 115.88 = 71.36 : x
  2. Step 2: Convert to fraction form
    84.32/115.88 = 71.36/x
  3. Step 3: Cross multiply
    84.32x = 115.88 × 71.36
  4. Step 4: Simplify right side
    84.32x = 8,269.20
  5. Step 5: Solve for x
    x = 8,269.20/84.32
  6. Step 6: Final answer
    x = 98.07

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.