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Finding the Fourth Proportional to 127.02, 175.30 and 71.78

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Solution

The fourth proportional to 127.02, 175.30 and 71.78 is: 99.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.02 : 175.30 = 71.78 : x
  2. Step 2: Convert to fraction form
    127.02/175.30 = 71.78/x
  3. Step 3: Cross multiply
    127.02x = 175.30 × 71.78
  4. Step 4: Simplify right side
    127.02x = 12,583.03
  5. Step 5: Solve for x
    x = 12,583.03/127.02
  6. Step 6: Final answer
    x = 99.06

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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.