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Finding the Fourth Proportional to 1,279.91, 1,920.11 and 499.88

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Solution

The fourth proportional to 1,279.91, 1,920.11 and 499.88 is: 749.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.91 : 1,920.11 = 499.88 : x
  2. Step 2: Convert to fraction form
    1,279.91/1,920.11 = 499.88/x
  3. Step 3: Cross multiply
    1,279.91x = 1,920.11 × 499.88
  4. Step 4: Simplify right side
    1,279.91x = 959,825.84
  5. Step 5: Solve for x
    x = 959,825.84/1,279.91
  6. Step 6: Final answer
    x = 749.92

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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.