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Finding the Fourth Proportional to 127.92, 176.64 and 100.40

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Solution

The fourth proportional to 127.92, 176.64 and 100.40 is: 138.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.92 : 176.64 = 100.40 : x
  2. Step 2: Convert to fraction form
    127.92/176.64 = 100.40/x
  3. Step 3: Cross multiply
    127.92x = 176.64 × 100.40
  4. Step 4: Simplify right side
    127.92x = 17,734.66
  5. Step 5: Solve for x
    x = 17,734.66/127.92
  6. Step 6: Final answer
    x = 138.64

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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.