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Finding the Fourth Proportional to 127.87, 191.90 and 66.98

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Solution

The fourth proportional to 127.87, 191.90 and 66.98 is: 100.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.87 : 191.90 = 66.98 : x
  2. Step 2: Convert to fraction form
    127.87/191.90 = 66.98/x
  3. Step 3: Cross multiply
    127.87x = 191.90 × 66.98
  4. Step 4: Simplify right side
    127.87x = 12,854.11
  5. Step 5: Solve for x
    x = 12,854.11/127.87
  6. Step 6: Final answer
    x = 100.53

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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.