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Finding the Fourth Proportional to 1,147.28, 1,718.87 and 780.75

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Solution

The fourth proportional to 1,147.28, 1,718.87 and 780.75 is: 1,169.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.28 : 1,718.87 = 780.75 : x
  2. Step 2: Convert to fraction form
    1,147.28/1,718.87 = 780.75/x
  3. Step 3: Cross multiply
    1,147.28x = 1,718.87 × 780.75
  4. Step 4: Simplify right side
    1,147.28x = 1,342,003.85
  5. Step 5: Solve for x
    x = 1,342,003.85/1,147.28
  6. Step 6: Final answer
    x = 1,169.73

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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.