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Finding the Fourth Proportional to 100.64, 138.74 and 76.04

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Solution

The fourth proportional to 100.64, 138.74 and 76.04 is: 104.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.64 : 138.74 = 76.04 : x
  2. Step 2: Convert to fraction form
    100.64/138.74 = 76.04/x
  3. Step 3: Cross multiply
    100.64x = 138.74 × 76.04
  4. Step 4: Simplify right side
    100.64x = 10,549.79
  5. Step 5: Solve for x
    x = 10,549.79/100.64
  6. Step 6: Final answer
    x = 104.83

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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.