Home / 1,221.43-1,685.79-926.20

Finding the Fourth Proportional to 1,221.43, 1,685.79 and 926.20

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Solution

The fourth proportional to 1,221.43, 1,685.79 and 926.20 is: 1,278.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.43 : 1,685.79 = 926.20 : x
  2. Step 2: Convert to fraction form
    1,221.43/1,685.79 = 926.20/x
  3. Step 3: Cross multiply
    1,221.43x = 1,685.79 × 926.20
  4. Step 4: Simplify right side
    1,221.43x = 1,561,378.70
  5. Step 5: Solve for x
    x = 1,561,378.70/1,221.43
  6. Step 6: Final answer
    x = 1,278.32

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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.