Home / 1,217.40-1,680.30-922.20

Finding the Fourth Proportional to 1,217.40, 1,680.30 and 922.20

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Solution

The fourth proportional to 1,217.40, 1,680.30 and 922.20 is: 1,272.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.40 : 1,680.30 = 922.20 : x
  2. Step 2: Convert to fraction form
    1,217.40/1,680.30 = 922.20/x
  3. Step 3: Cross multiply
    1,217.40x = 1,680.30 × 922.20
  4. Step 4: Simplify right side
    1,217.40x = 1,549,572.66
  5. Step 5: Solve for x
    x = 1,549,572.66/1,217.40
  6. Step 6: Final answer
    x = 1,272.85

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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.