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Finding the Fourth Proportional to 100.36, 138.52 and 61

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Solution

The fourth proportional to 100.36, 138.52 and 61 is: 84.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.36 : 138.52 = 61 : x
  2. Step 2: Convert to fraction form
    100.36/138.52 = 61/x
  3. Step 3: Cross multiply
    100.36x = 138.52 × 61
  4. Step 4: Simplify right side
    100.36x = 8,449.72
  5. Step 5: Solve for x
    x = 8,449.72/100.36
  6. Step 6: Final answer
    x = 84.19

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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.