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Finding the Fourth Proportional to 127.98, 191.88 and 45.66

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Solution

The fourth proportional to 127.98, 191.88 and 45.66 is: 68.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.98 : 191.88 = 45.66 : x
  2. Step 2: Convert to fraction form
    127.98/191.88 = 45.66/x
  3. Step 3: Cross multiply
    127.98x = 191.88 × 45.66
  4. Step 4: Simplify right side
    127.98x = 8,760.28
  5. Step 5: Solve for x
    x = 8,760.28/127.98
  6. Step 6: Final answer
    x = 68.45

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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.