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Finding the Fourth Proportional to 127.15, 175.48 and 71.90

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Solution

The fourth proportional to 127.15, 175.48 and 71.90 is: 99.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.15 : 175.48 = 71.90 : x
  2. Step 2: Convert to fraction form
    127.15/175.48 = 71.90/x
  3. Step 3: Cross multiply
    127.15x = 175.48 × 71.90
  4. Step 4: Simplify right side
    127.15x = 12,616.52
  5. Step 5: Solve for x
    x = 12,616.52/127.15
  6. Step 6: Final answer
    x = 99.22

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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.