Home / 1,680.68-2,319.40-1,120.78

Finding the Fourth Proportional to 1,680.68, 2,319.40 and 1,120.78

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Solution

The fourth proportional to 1,680.68, 2,319.40 and 1,120.78 is: 1,546.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,680.68 : 2,319.40 = 1,120.78 : x
  2. Step 2: Convert to fraction form
    1,680.68/2,319.40 = 1,120.78/x
  3. Step 3: Cross multiply
    1,680.68x = 2,319.40 × 1,120.78
  4. Step 4: Simplify right side
    1,680.68x = 2,599,537.13
  5. Step 5: Solve for x
    x = 2,599,537.13/1,680.68
  6. Step 6: Final answer
    x = 1,546.72

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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.