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Finding the Fourth Proportional to 168.85, 253.18 and 66.10

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Solution

The fourth proportional to 168.85, 253.18 and 66.10 is: 99.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.85 : 253.18 = 66.10 : x
  2. Step 2: Convert to fraction form
    168.85/253.18 = 66.10/x
  3. Step 3: Cross multiply
    168.85x = 253.18 × 66.10
  4. Step 4: Simplify right side
    168.85x = 16,735.82
  5. Step 5: Solve for x
    x = 16,735.82/168.85
  6. Step 6: Final answer
    x = 99.12

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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.