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Finding the Fourth Proportional to 100.72, 139.08 and 92.08

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Solution

The fourth proportional to 100.72, 139.08 and 92.08 is: 127.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.72 : 139.08 = 92.08 : x
  2. Step 2: Convert to fraction form
    100.72/139.08 = 92.08/x
  3. Step 3: Cross multiply
    100.72x = 139.08 × 92.08
  4. Step 4: Simplify right side
    100.72x = 12,806.49
  5. Step 5: Solve for x
    x = 12,806.49/100.72
  6. Step 6: Final answer
    x = 127.15

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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.