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Finding the Fourth Proportional to 260.15, 390.17 and 77.56

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Solution

The fourth proportional to 260.15, 390.17 and 77.56 is: 116.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.15 : 390.17 = 77.56 : x
  2. Step 2: Convert to fraction form
    260.15/390.17 = 77.56/x
  3. Step 3: Cross multiply
    260.15x = 390.17 × 77.56
  4. Step 4: Simplify right side
    260.15x = 30,260.80
  5. Step 5: Solve for x
    x = 30,260.80/260.15
  6. Step 6: Final answer
    x = 116.32

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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.