Home / 1,921.12-2,651.24-1,081.76

Finding the Fourth Proportional to 1,921.12, 2,651.24 and 1,081.76

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Solution

The fourth proportional to 1,921.12, 2,651.24 and 1,081.76 is: 1,492.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,921.12 : 2,651.24 = 1,081.76 : x
  2. Step 2: Convert to fraction form
    1,921.12/2,651.24 = 1,081.76/x
  3. Step 3: Cross multiply
    1,921.12x = 2,651.24 × 1,081.76
  4. Step 4: Simplify right side
    1,921.12x = 2,868,005.38
  5. Step 5: Solve for x
    x = 2,868,005.38/1,921.12
  6. Step 6: Final answer
    x = 1,492.88

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Half scale
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Double scale
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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.