Home / 2,385.28-3,291.37-1,390.74

Finding the Fourth Proportional to 2,385.28, 3,291.37 and 1,390.74

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Solution

The fourth proportional to 2,385.28, 3,291.37 and 1,390.74 is: 1,919.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,385.28 : 3,291.37 = 1,390.74 : x
  2. Step 2: Convert to fraction form
    2,385.28/3,291.37 = 1,390.74/x
  3. Step 3: Cross multiply
    2,385.28x = 3,291.37 × 1,390.74
  4. Step 4: Simplify right side
    2,385.28x = 4,577,439.91
  5. Step 5: Solve for x
    x = 4,577,439.91/2,385.28
  6. Step 6: Final answer
    x = 1,919.04

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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.