Home / 1,787.18-2,680.25-691.29

Finding the Fourth Proportional to 1,787.18, 2,680.25 and 691.29

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Solution

The fourth proportional to 1,787.18, 2,680.25 and 691.29 is: 1,036.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,787.18 : 2,680.25 = 691.29 : x
  2. Step 2: Convert to fraction form
    1,787.18/2,680.25 = 691.29/x
  3. Step 3: Cross multiply
    1,787.18x = 2,680.25 × 691.29
  4. Step 4: Simplify right side
    1,787.18x = 1,852,831.75
  5. Step 5: Solve for x
    x = 1,852,831.75/1,787.18
  6. Step 6: Final answer
    x = 1,036.73

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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.