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Finding the Fourth Proportional to 127.24, 191.55 and 115.90

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Solution

The fourth proportional to 127.24, 191.55 and 115.90 is: 174.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.24 : 191.55 = 115.90 : x
  2. Step 2: Convert to fraction form
    127.24/191.55 = 115.90/x
  3. Step 3: Cross multiply
    127.24x = 191.55 × 115.90
  4. Step 4: Simplify right side
    127.24x = 22,199.95
  5. Step 5: Solve for x
    x = 22,199.95/127.24
  6. Step 6: Final answer
    x = 174.48

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.