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Finding the Fourth Proportional to 127.88, 191.93 and 66.21

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Solution

The fourth proportional to 127.88, 191.93 and 66.21 is: 99.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.88 : 191.93 = 66.21 : x
  2. Step 2: Convert to fraction form
    127.88/191.93 = 66.21/x
  3. Step 3: Cross multiply
    127.88x = 191.93 × 66.21
  4. Step 4: Simplify right side
    127.88x = 12,707.35
  5. Step 5: Solve for x
    x = 12,707.35/127.88
  6. Step 6: Final answer
    x = 99.37

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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.