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Finding the Fourth Proportional to 261.12, 391.48 and 87.68

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Solution

The fourth proportional to 261.12, 391.48 and 87.68 is: 131.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.12 : 391.48 = 87.68 : x
  2. Step 2: Convert to fraction form
    261.12/391.48 = 87.68/x
  3. Step 3: Cross multiply
    261.12x = 391.48 × 87.68
  4. Step 4: Simplify right side
    261.12x = 34,324.97
  5. Step 5: Solve for x
    x = 34,324.97/261.12
  6. Step 6: Final answer
    x = 131.45

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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.