Home / 1,279.68-1,919.76-549.12

Finding the Fourth Proportional to 1,279.68, 1,919.76 and 549.12

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Solution

The fourth proportional to 1,279.68, 1,919.76 and 549.12 is: 823.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.68 : 1,919.76 = 549.12 : x
  2. Step 2: Convert to fraction form
    1,279.68/1,919.76 = 549.12/x
  3. Step 3: Cross multiply
    1,279.68x = 1,919.76 × 549.12
  4. Step 4: Simplify right side
    1,279.68x = 1,054,178.61
  5. Step 5: Solve for x
    x = 1,054,178.61/1,279.68
  6. Step 6: Final answer
    x = 823.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.