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Finding the Fourth Proportional to 100.07, 138.11 and 60.75

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Solution

The fourth proportional to 100.07, 138.11 and 60.75 is: 83.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.07 : 138.11 = 60.75 : x
  2. Step 2: Convert to fraction form
    100.07/138.11 = 60.75/x
  3. Step 3: Cross multiply
    100.07x = 138.11 × 60.75
  4. Step 4: Simplify right side
    100.07x = 8,389.88
  5. Step 5: Solve for x
    x = 8,389.88/100.07
  6. Step 6: Final answer
    x = 83.84

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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.