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Finding the Fourth Proportional to 127.30, 190.98 and 66.42

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Solution

The fourth proportional to 127.30, 190.98 and 66.42 is: 99.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.30 : 190.98 = 66.42 : x
  2. Step 2: Convert to fraction form
    127.30/190.98 = 66.42/x
  3. Step 3: Cross multiply
    127.30x = 190.98 × 66.42
  4. Step 4: Simplify right side
    127.30x = 12,684.35
  5. Step 5: Solve for x
    x = 12,684.35/127.30
  6. Step 6: Final answer
    x = 99.64

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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.