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Finding the Fourth Proportional to 127.56, 175.56 and 98.40

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Solution

The fourth proportional to 127.56, 175.56 and 98.40 is: 135.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.56 : 175.56 = 98.40 : x
  2. Step 2: Convert to fraction form
    127.56/175.56 = 98.40/x
  3. Step 3: Cross multiply
    127.56x = 175.56 × 98.40
  4. Step 4: Simplify right side
    127.56x = 17,275.10
  5. Step 5: Solve for x
    x = 17,275.10/127.56
  6. Step 6: Final answer
    x = 135.43

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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.