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Finding the Fourth Proportional to 127.08, 175.46 and 100.80

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Solution

The fourth proportional to 127.08, 175.46 and 100.80 is: 139.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.08 : 175.46 = 100.80 : x
  2. Step 2: Convert to fraction form
    127.08/175.46 = 100.80/x
  3. Step 3: Cross multiply
    127.08x = 175.46 × 100.80
  4. Step 4: Simplify right side
    127.08x = 17,685.86
  5. Step 5: Solve for x
    x = 17,685.86/127.08
  6. Step 6: Final answer
    x = 139.17

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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.