Home / 1,981.92-2,731.36-1,422.40

Finding the Fourth Proportional to 1,981.92, 2,731.36 and 1,422.40

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Solution

The fourth proportional to 1,981.92, 2,731.36 and 1,422.40 is: 1,960.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,981.92 : 2,731.36 = 1,422.40 : x
  2. Step 2: Convert to fraction form
    1,981.92/2,731.36 = 1,422.40/x
  3. Step 3: Cross multiply
    1,981.92x = 2,731.36 × 1,422.40
  4. Step 4: Simplify right side
    1,981.92x = 3,885,086.46
  5. Step 5: Solve for x
    x = 3,885,086.46/1,981.92
  6. Step 6: Final answer
    x = 1,960.26

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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.