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Finding the Fourth Proportional to 127.17, 190.26 and 86.31

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Solution

The fourth proportional to 127.17, 190.26 and 86.31 is: 129.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.17 : 190.26 = 86.31 : x
  2. Step 2: Convert to fraction form
    127.17/190.26 = 86.31/x
  3. Step 3: Cross multiply
    127.17x = 190.26 × 86.31
  4. Step 4: Simplify right side
    127.17x = 16,421.34
  5. Step 5: Solve for x
    x = 16,421.34/127.17
  6. Step 6: Final answer
    x = 129.13

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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.