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Finding the Fourth Proportional to 169.30, 252.86 and 145

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Solution

The fourth proportional to 169.30, 252.86 and 145 is: 216.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.30 : 252.86 = 145 : x
  2. Step 2: Convert to fraction form
    169.30/252.86 = 145/x
  3. Step 3: Cross multiply
    169.30x = 252.86 × 145
  4. Step 4: Simplify right side
    169.30x = 36,664.70
  5. Step 5: Solve for x
    x = 36,664.70/169.30
  6. Step 6: Final answer
    x = 216.57

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.