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Finding the Fourth Proportional to 172.32, 237.90 and 130.87

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Solution

The fourth proportional to 172.32, 237.90 and 130.87 is: 180.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.32 : 237.90 = 130.87 : x
  2. Step 2: Convert to fraction form
    172.32/237.90 = 130.87/x
  3. Step 3: Cross multiply
    172.32x = 237.90 × 130.87
  4. Step 4: Simplify right side
    172.32x = 31,133.97
  5. Step 5: Solve for x
    x = 31,133.97/172.32
  6. Step 6: Final answer
    x = 180.68

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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.