Home / 2,117.28-3,171.60-1,387.20

Finding the Fourth Proportional to 2,117.28, 3,171.60 and 1,387.20

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Solution

The fourth proportional to 2,117.28, 3,171.60 and 1,387.20 is: 2,077.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,117.28 : 3,171.60 = 1,387.20 : x
  2. Step 2: Convert to fraction form
    2,117.28/3,171.60 = 1,387.20/x
  3. Step 3: Cross multiply
    2,117.28x = 3,171.60 × 1,387.20
  4. Step 4: Simplify right side
    2,117.28x = 4,399,643.52
  5. Step 5: Solve for x
    x = 4,399,643.52/2,117.28
  6. Step 6: Final answer
    x = 2,077.97

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.