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Finding the Fourth Proportional to 1,279.75, 1,920.09 and 663.07

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Solution

The fourth proportional to 1,279.75, 1,920.09 and 663.07 is: 994.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.75 : 1,920.09 = 663.07 : x
  2. Step 2: Convert to fraction form
    1,279.75/1,920.09 = 663.07/x
  3. Step 3: Cross multiply
    1,279.75x = 1,920.09 × 663.07
  4. Step 4: Simplify right side
    1,279.75x = 1,273,154.08
  5. Step 5: Solve for x
    x = 1,273,154.08/1,279.75
  6. Step 6: Final answer
    x = 994.85

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1.5x scale

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.