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Finding the Fourth Proportional to 100.24, 138.34 and 60.89

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Solution

The fourth proportional to 100.24, 138.34 and 60.89 is: 84.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.24 : 138.34 = 60.89 : x
  2. Step 2: Convert to fraction form
    100.24/138.34 = 60.89/x
  3. Step 3: Cross multiply
    100.24x = 138.34 × 60.89
  4. Step 4: Simplify right side
    100.24x = 8,422.91
  5. Step 5: Solve for x
    x = 8,422.91/100.24
  6. Step 6: Final answer
    x = 84.03

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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.