Home / 1,279.72-1,919.12-549.08

Finding the Fourth Proportional to 1,279.72, 1,919.12 and 549.08

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Solution

The fourth proportional to 1,279.72, 1,919.12 and 549.08 is: 823.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.72 : 1,919.12 = 549.08 : x
  2. Step 2: Convert to fraction form
    1,279.72/1,919.12 = 549.08/x
  3. Step 3: Cross multiply
    1,279.72x = 1,919.12 × 549.08
  4. Step 4: Simplify right side
    1,279.72x = 1,053,750.41
  5. Step 5: Solve for x
    x = 1,053,750.41/1,279.72
  6. Step 6: Final answer
    x = 823.42

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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.