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Finding the Fourth Proportional to 127.12, 175.40 and 71.85

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Solution

The fourth proportional to 127.12, 175.40 and 71.85 is: 99.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.12 : 175.40 = 71.85 : x
  2. Step 2: Convert to fraction form
    127.12/175.40 = 71.85/x
  3. Step 3: Cross multiply
    127.12x = 175.40 × 71.85
  4. Step 4: Simplify right side
    127.12x = 12,603.46
  5. Step 5: Solve for x
    x = 12,603.46/127.12
  6. Step 6: Final answer
    x = 99.15

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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.