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Finding the Fourth Proportional to 150.31, 207.21 and 129.80

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Solution

The fourth proportional to 150.31, 207.21 and 129.80 is: 178.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    150.31 : 207.21 = 129.80 : x
  2. Step 2: Convert to fraction form
    150.31/207.21 = 129.80/x
  3. Step 3: Cross multiply
    150.31x = 207.21 × 129.80
  4. Step 4: Simplify right side
    150.31x = 26,895.86
  5. Step 5: Solve for x
    x = 26,895.86/150.31
  6. Step 6: Final answer
    x = 178.94

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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.