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Finding the Fourth Proportional to 1,192.72, 1,789.35 and 499

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Solution

The fourth proportional to 1,192.72, 1,789.35 and 499 is: 748.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,192.72 : 1,789.35 = 499 : x
  2. Step 2: Convert to fraction form
    1,192.72/1,789.35 = 499/x
  3. Step 3: Cross multiply
    1,192.72x = 1,789.35 × 499
  4. Step 4: Simplify right side
    1,192.72x = 892,885.65
  5. Step 5: Solve for x
    x = 892,885.65/1,192.72
  6. Step 6: Final answer
    x = 748.61

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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.