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Finding the Fourth Proportional to 259.75, 389.61 and 77.14

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Solution

The fourth proportional to 259.75, 389.61 and 77.14 is: 115.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.75 : 389.61 = 77.14 : x
  2. Step 2: Convert to fraction form
    259.75/389.61 = 77.14/x
  3. Step 3: Cross multiply
    259.75x = 389.61 × 77.14
  4. Step 4: Simplify right side
    259.75x = 30,054.52
  5. Step 5: Solve for x
    x = 30,054.52/259.75
  6. Step 6: Final answer
    x = 115.71

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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.