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Finding the Fourth Proportional to 168.46, 253.70 and 142.95

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Solution

The fourth proportional to 168.46, 253.70 and 142.95 is: 215.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.46 : 253.70 = 142.95 : x
  2. Step 2: Convert to fraction form
    168.46/253.70 = 142.95/x
  3. Step 3: Cross multiply
    168.46x = 253.70 × 142.95
  4. Step 4: Simplify right side
    168.46x = 36,266.42
  5. Step 5: Solve for x
    x = 36,266.42/168.46
  6. Step 6: Final answer
    x = 215.28

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.