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Finding the Fourth Proportional to 127.31, 190.96 and 66.40

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Solution

The fourth proportional to 127.31, 190.96 and 66.40 is: 99.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.31 : 190.96 = 66.40 : x
  2. Step 2: Convert to fraction form
    127.31/190.96 = 66.40/x
  3. Step 3: Cross multiply
    127.31x = 190.96 × 66.40
  4. Step 4: Simplify right side
    127.31x = 12,679.10
  5. Step 5: Solve for x
    x = 12,679.10/127.31
  6. Step 6: Final answer
    x = 99.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.