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Finding the Fourth Proportional to 100.08, 138.05 and 73.91

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Solution

The fourth proportional to 100.08, 138.05 and 73.91 is: 101.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.08 : 138.05 = 73.91 : x
  2. Step 2: Convert to fraction form
    100.08/138.05 = 73.91/x
  3. Step 3: Cross multiply
    100.08x = 138.05 × 73.91
  4. Step 4: Simplify right side
    100.08x = 10,203.28
  5. Step 5: Solve for x
    x = 10,203.28/100.08
  6. Step 6: Final answer
    x = 101.95

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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.