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Finding the Fourth Proportional to 172.18, 237.45 and 106.66

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Solution

The fourth proportional to 172.18, 237.45 and 106.66 is: 147.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.18 : 237.45 = 106.66 : x
  2. Step 2: Convert to fraction form
    172.18/237.45 = 106.66/x
  3. Step 3: Cross multiply
    172.18x = 237.45 × 106.66
  4. Step 4: Simplify right side
    172.18x = 25,326.42
  5. Step 5: Solve for x
    x = 25,326.42/172.18
  6. Step 6: Final answer
    x = 147.09

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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.