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Finding the Fourth Proportional to 192.71, 266.10 and 122.90

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Solution

The fourth proportional to 192.71, 266.10 and 122.90 is: 169.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.71 : 266.10 = 122.90 : x
  2. Step 2: Convert to fraction form
    192.71/266.10 = 122.90/x
  3. Step 3: Cross multiply
    192.71x = 266.10 × 122.90
  4. Step 4: Simplify right side
    192.71x = 32,702.82
  5. Step 5: Solve for x
    x = 32,702.82/192.71
  6. Step 6: Final answer
    x = 169.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.