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Finding the Fourth Proportional to 84.18, 115.98 and 55.02

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Solution

The fourth proportional to 84.18, 115.98 and 55.02 is: 75.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.18 : 115.98 = 55.02 : x
  2. Step 2: Convert to fraction form
    84.18/115.98 = 55.02/x
  3. Step 3: Cross multiply
    84.18x = 115.98 × 55.02
  4. Step 4: Simplify right side
    84.18x = 6,381.22
  5. Step 5: Solve for x
    x = 6,381.22/84.18
  6. Step 6: Final answer
    x = 75.80

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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.