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Finding the Fourth Proportional to 168.78, 233.04 and 129.90

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Solution

The fourth proportional to 168.78, 233.04 and 129.90 is: 179.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.78 : 233.04 = 129.90 : x
  2. Step 2: Convert to fraction form
    168.78/233.04 = 129.90/x
  3. Step 3: Cross multiply
    168.78x = 233.04 × 129.90
  4. Step 4: Simplify right side
    168.78x = 30,271.90
  5. Step 5: Solve for x
    x = 30,271.90/168.78
  6. Step 6: Final answer
    x = 179.36

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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.