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Finding the Fourth Proportional to 127.65, 190.61 and 104.87

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Solution

The fourth proportional to 127.65, 190.61 and 104.87 is: 156.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.65 : 190.61 = 104.87 : x
  2. Step 2: Convert to fraction form
    127.65/190.61 = 104.87/x
  3. Step 3: Cross multiply
    127.65x = 190.61 × 104.87
  4. Step 4: Simplify right side
    127.65x = 19,989.22
  5. Step 5: Solve for x
    x = 19,989.22/127.65
  6. Step 6: Final answer
    x = 156.59

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.