Home / 1,778.40-2,454.89-1,188.72

Finding the Fourth Proportional to 1,778.40, 2,454.89 and 1,188.72

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Solution

The fourth proportional to 1,778.40, 2,454.89 and 1,188.72 is: 1,640.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,778.40 : 2,454.89 = 1,188.72 : x
  2. Step 2: Convert to fraction form
    1,778.40/2,454.89 = 1,188.72/x
  3. Step 3: Cross multiply
    1,778.40x = 2,454.89 × 1,188.72
  4. Step 4: Simplify right side
    1,778.40x = 2,918,170.90
  5. Step 5: Solve for x
    x = 2,918,170.90/1,778.40
  6. Step 6: Final answer
    x = 1,640.90

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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.