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Finding the Fourth Proportional to 127.95, 176.90 and 111.55

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Solution

The fourth proportional to 127.95, 176.90 and 111.55 is: 154.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.95 : 176.90 = 111.55 : x
  2. Step 2: Convert to fraction form
    127.95/176.90 = 111.55/x
  3. Step 3: Cross multiply
    127.95x = 176.90 × 111.55
  4. Step 4: Simplify right side
    127.95x = 19,733.20
  5. Step 5: Solve for x
    x = 19,733.20/127.95
  6. Step 6: Final answer
    x = 154.23

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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.