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Finding the Fourth Proportional to 260.55, 390.84 and 87.14

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Solution

The fourth proportional to 260.55, 390.84 and 87.14 is: 130.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.55 : 390.84 = 87.14 : x
  2. Step 2: Convert to fraction form
    260.55/390.84 = 87.14/x
  3. Step 3: Cross multiply
    260.55x = 390.84 × 87.14
  4. Step 4: Simplify right side
    260.55x = 34,057.80
  5. Step 5: Solve for x
    x = 34,057.80/260.55
  6. Step 6: Final answer
    x = 130.72

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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.