Home / 1,947.60-2,688.20-1,285.20

Finding the Fourth Proportional to 1,947.60, 2,688.20 and 1,285.20

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Solution

The fourth proportional to 1,947.60, 2,688.20 and 1,285.20 is: 1,773.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,947.60 : 2,688.20 = 1,285.20 : x
  2. Step 2: Convert to fraction form
    1,947.60/2,688.20 = 1,285.20/x
  3. Step 3: Cross multiply
    1,947.60x = 2,688.20 × 1,285.20
  4. Step 4: Simplify right side
    1,947.60x = 3,454,874.64
  5. Step 5: Solve for x
    x = 3,454,874.64/1,947.60
  6. Step 6: Final answer
    x = 1,773.91

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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.