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Finding the Fourth Proportional to 100.76, 139.07 and 92.57

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Solution

The fourth proportional to 100.76, 139.07 and 92.57 is: 127.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.76 : 139.07 = 92.57 : x
  2. Step 2: Convert to fraction form
    100.76/139.07 = 92.57/x
  3. Step 3: Cross multiply
    100.76x = 139.07 × 92.57
  4. Step 4: Simplify right side
    100.76x = 12,873.71
  5. Step 5: Solve for x
    x = 12,873.71/100.76
  6. Step 6: Final answer
    x = 127.77

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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.