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Finding the Fourth Proportional to 100.76, 138.14 and 98.04

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Solution

The fourth proportional to 100.76, 138.14 and 98.04 is: 134.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.76 : 138.14 = 98.04 : x
  2. Step 2: Convert to fraction form
    100.76/138.14 = 98.04/x
  3. Step 3: Cross multiply
    100.76x = 138.14 × 98.04
  4. Step 4: Simplify right side
    100.76x = 13,543.25
  5. Step 5: Solve for x
    x = 13,543.25/100.76
  6. Step 6: Final answer
    x = 134.41

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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.