Home / 2,117.28-2,920.80-1,331.52

Finding the Fourth Proportional to 2,117.28, 2,920.80 and 1,331.52

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Solution

The fourth proportional to 2,117.28, 2,920.80 and 1,331.52 is: 1,836.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,117.28 : 2,920.80 = 1,331.52 : x
  2. Step 2: Convert to fraction form
    2,117.28/2,920.80 = 1,331.52/x
  3. Step 3: Cross multiply
    2,117.28x = 2,920.80 × 1,331.52
  4. Step 4: Simplify right side
    2,117.28x = 3,889,103.62
  5. Step 5: Solve for x
    x = 3,889,103.62/2,117.28
  6. Step 6: Final answer
    x = 1,836.84

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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.