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Finding the Fourth Proportional to 168.85, 253.40 and 77.61

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Solution

The fourth proportional to 168.85, 253.40 and 77.61 is: 116.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.85 : 253.40 = 77.61 : x
  2. Step 2: Convert to fraction form
    168.85/253.40 = 77.61/x
  3. Step 3: Cross multiply
    168.85x = 253.40 × 77.61
  4. Step 4: Simplify right side
    168.85x = 19,666.37
  5. Step 5: Solve for x
    x = 19,666.37/168.85
  6. Step 6: Final answer
    x = 116.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.