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Finding the Fourth Proportional to 84.13, 116.10 and 55

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Solution

The fourth proportional to 84.13, 116.10 and 55 is: 75.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.13 : 116.10 = 55 : x
  2. Step 2: Convert to fraction form
    84.13/116.10 = 55/x
  3. Step 3: Cross multiply
    84.13x = 116.10 × 55
  4. Step 4: Simplify right side
    84.13x = 6,385.50
  5. Step 5: Solve for x
    x = 6,385.50/84.13
  6. Step 6: Final answer
    x = 75.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.