Home / 1,285.20-1,925.75-763.97

Finding the Fourth Proportional to 1,285.20, 1,925.75 and 763.97

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Solution

The fourth proportional to 1,285.20, 1,925.75 and 763.97 is: 1,144.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.20 : 1,925.75 = 763.97 : x
  2. Step 2: Convert to fraction form
    1,285.20/1,925.75 = 763.97/x
  3. Step 3: Cross multiply
    1,285.20x = 1,925.75 × 763.97
  4. Step 4: Simplify right side
    1,285.20x = 1,471,205.60
  5. Step 5: Solve for x
    x = 1,471,205.60/1,285.20
  6. Step 6: Final answer
    x = 1,144.73

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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.