Home / 1,787.20-2,669.90-1,422.40

Finding the Fourth Proportional to 1,787.20, 2,669.90 and 1,422.40

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Solution

The fourth proportional to 1,787.20, 2,669.90 and 1,422.40 is: 2,124.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,787.20 : 2,669.90 = 1,422.40 : x
  2. Step 2: Convert to fraction form
    1,787.20/2,669.90 = 1,422.40/x
  3. Step 3: Cross multiply
    1,787.20x = 2,669.90 × 1,422.40
  4. Step 4: Simplify right side
    1,787.20x = 3,797,665.76
  5. Step 5: Solve for x
    x = 3,797,665.76/1,787.20
  6. Step 6: Final answer
    x = 2,124.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.