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Finding the Fourth Proportional to 127.20, 175.48 and 74.72

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Solution

The fourth proportional to 127.20, 175.48 and 74.72 is: 103.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.20 : 175.48 = 74.72 : x
  2. Step 2: Convert to fraction form
    127.20/175.48 = 74.72/x
  3. Step 3: Cross multiply
    127.20x = 175.48 × 74.72
  4. Step 4: Simplify right side
    127.20x = 13,111.87
  5. Step 5: Solve for x
    x = 13,111.87/127.20
  6. Step 6: Final answer
    x = 103.08

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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.