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Finding the Fourth Proportional to 261.87, 392.78 and 115.59

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Solution

The fourth proportional to 261.87, 392.78 and 115.59 is: 173.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.87 : 392.78 = 115.59 : x
  2. Step 2: Convert to fraction form
    261.87/392.78 = 115.59/x
  3. Step 3: Cross multiply
    261.87x = 392.78 × 115.59
  4. Step 4: Simplify right side
    261.87x = 45,400.86
  5. Step 5: Solve for x
    x = 45,400.86/261.87
  6. Step 6: Final answer
    x = 173.37

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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.