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Finding the Fourth Proportional to 90.84, 136.14 and 66.80

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Solution

The fourth proportional to 90.84, 136.14 and 66.80 is: 100.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.84 : 136.14 = 66.80 : x
  2. Step 2: Convert to fraction form
    90.84/136.14 = 66.80/x
  3. Step 3: Cross multiply
    90.84x = 136.14 × 66.80
  4. Step 4: Simplify right side
    90.84x = 9,094.15
  5. Step 5: Solve for x
    x = 9,094.15/90.84
  6. Step 6: Final answer
    x = 100.11

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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.