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Finding the Fourth Proportional to 127.15, 175.43 and 90.29

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Solution

The fourth proportional to 127.15, 175.43 and 90.29 is: 124.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.15 : 175.43 = 90.29 : x
  2. Step 2: Convert to fraction form
    127.15/175.43 = 90.29/x
  3. Step 3: Cross multiply
    127.15x = 175.43 × 90.29
  4. Step 4: Simplify right side
    127.15x = 15,839.57
  5. Step 5: Solve for x
    x = 15,839.57/127.15
  6. Step 6: Final answer
    x = 124.58

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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.