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Finding the Fourth Proportional to 127.17, 190.86 and 86.64

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Solution

The fourth proportional to 127.17, 190.86 and 86.64 is: 130.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.17 : 190.86 = 86.64 : x
  2. Step 2: Convert to fraction form
    127.17/190.86 = 86.64/x
  3. Step 3: Cross multiply
    127.17x = 190.86 × 86.64
  4. Step 4: Simplify right side
    127.17x = 16,536.11
  5. Step 5: Solve for x
    x = 16,536.11/127.17
  6. Step 6: Final answer
    x = 130.03

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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.