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Finding the Fourth Proportional to 260.90, 391.41 and 87.57

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Solution

The fourth proportional to 260.90, 391.41 and 87.57 is: 131.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.90 : 391.41 = 87.57 : x
  2. Step 2: Convert to fraction form
    260.90/391.41 = 87.57/x
  3. Step 3: Cross multiply
    260.90x = 391.41 × 87.57
  4. Step 4: Simplify right side
    260.90x = 34,275.77
  5. Step 5: Solve for x
    x = 34,275.77/260.90
  6. Step 6: Final answer
    x = 131.38

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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.