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Finding the Fourth Proportional to 1,285.40, 1,773.82 and 725.85

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Solution

The fourth proportional to 1,285.40, 1,773.82 and 725.85 is: 1,001.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.40 : 1,773.82 = 725.85 : x
  2. Step 2: Convert to fraction form
    1,285.40/1,773.82 = 725.85/x
  3. Step 3: Cross multiply
    1,285.40x = 1,773.82 × 725.85
  4. Step 4: Simplify right side
    1,285.40x = 1,287,527.25
  5. Step 5: Solve for x
    x = 1,287,527.25/1,285.40
  6. Step 6: Final answer
    x = 1,001.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.