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Finding the Fourth Proportional to 127.31, 175.58 and 90.40

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Solution

The fourth proportional to 127.31, 175.58 and 90.40 is: 124.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.31 : 175.58 = 90.40 : x
  2. Step 2: Convert to fraction form
    127.31/175.58 = 90.40/x
  3. Step 3: Cross multiply
    127.31x = 175.58 × 90.40
  4. Step 4: Simplify right side
    127.31x = 15,872.43
  5. Step 5: Solve for x
    x = 15,872.43/127.31
  6. Step 6: Final answer
    x = 124.68

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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.