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Finding the Fourth Proportional to 99.60, 136.94 and 85.02

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Solution

The fourth proportional to 99.60, 136.94 and 85.02 is: 116.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.60 : 136.94 = 85.02 : x
  2. Step 2: Convert to fraction form
    99.60/136.94 = 85.02/x
  3. Step 3: Cross multiply
    99.60x = 136.94 × 85.02
  4. Step 4: Simplify right side
    99.60x = 11,642.21
  5. Step 5: Solve for x
    x = 11,642.21/99.60
  6. Step 6: Final answer
    x = 116.89

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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.