Home / 1,780.20-2,454.75-1,248.90

Finding the Fourth Proportional to 1,780.20, 2,454.75 and 1,248.90

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Solution

The fourth proportional to 1,780.20, 2,454.75 and 1,248.90 is: 1,722.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,780.20 : 2,454.75 = 1,248.90 : x
  2. Step 2: Convert to fraction form
    1,780.20/2,454.75 = 1,248.90/x
  3. Step 3: Cross multiply
    1,780.20x = 2,454.75 × 1,248.90
  4. Step 4: Simplify right side
    1,780.20x = 3,065,737.28
  5. Step 5: Solve for x
    x = 3,065,737.28/1,780.20
  6. Step 6: Final answer
    x = 1,722.13

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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.