Home / 1,318.28-1,813.98-1,278.20

Finding the Fourth Proportional to 1,318.28, 1,813.98 and 1,278.20

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Solution

The fourth proportional to 1,318.28, 1,813.98 and 1,278.20 is: 1,758.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.28 : 1,813.98 = 1,278.20 : x
  2. Step 2: Convert to fraction form
    1,318.28/1,813.98 = 1,278.20/x
  3. Step 3: Cross multiply
    1,318.28x = 1,813.98 × 1,278.20
  4. Step 4: Simplify right side
    1,318.28x = 2,318,629.24
  5. Step 5: Solve for x
    x = 2,318,629.24/1,318.28
  6. Step 6: Final answer
    x = 1,758.83

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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.