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Finding the Fourth Proportional to 261, 390.94 and 169.43

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Solution

The fourth proportional to 261, 390.94 and 169.43 is: 253.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    261 : 390.94 = 169.43 : x
  2. Step 2: Convert to fraction form
    261/390.94 = 169.43/x
  3. Step 3: Cross multiply
    261x = 390.94 × 169.43
  4. Step 4: Simplify right side
    261x = 66,236.96
  5. Step 5: Solve for x
    x = 66,236.96/261
  6. Step 6: Final answer
    x = 253.78

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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.