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Finding the Fourth Proportional to 127.48, 191.21 and 40.82

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Solution

The fourth proportional to 127.48, 191.21 and 40.82 is: 61.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.48 : 191.21 = 40.82 : x
  2. Step 2: Convert to fraction form
    127.48/191.21 = 40.82/x
  3. Step 3: Cross multiply
    127.48x = 191.21 × 40.82
  4. Step 4: Simplify right side
    127.48x = 7,804.71
  5. Step 5: Solve for x
    x = 7,804.71/127.48
  6. Step 6: Final answer
    x = 61.23

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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.