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Finding the Fourth Proportional to 261, 390.60 and 169.56

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Solution

The fourth proportional to 261, 390.60 and 169.56 is: 253.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    261 : 390.60 = 169.56 : x
  2. Step 2: Convert to fraction form
    261/390.60 = 169.56/x
  3. Step 3: Cross multiply
    261x = 390.60 × 169.56
  4. Step 4: Simplify right side
    261x = 66,230.14
  5. Step 5: Solve for x
    x = 66,230.14/261
  6. Step 6: Final answer
    x = 253.76

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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.