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Finding the Fourth Proportional to 1,279.92, 1,920.24 and 549.30

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Solution

The fourth proportional to 1,279.92, 1,920.24 and 549.30 is: 824.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.92 : 1,920.24 = 549.30 : x
  2. Step 2: Convert to fraction form
    1,279.92/1,920.24 = 549.30/x
  3. Step 3: Cross multiply
    1,279.92x = 1,920.24 × 549.30
  4. Step 4: Simplify right side
    1,279.92x = 1,054,787.83
  5. Step 5: Solve for x
    x = 1,054,787.83/1,279.92
  6. Step 6: Final answer
    x = 824.10

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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.