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Finding the Fourth Proportional to 1,662.24, 2,491.20 and 687

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Solution

The fourth proportional to 1,662.24, 2,491.20 and 687 is: 1,029.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,662.24 : 2,491.20 = 687 : x
  2. Step 2: Convert to fraction form
    1,662.24/2,491.20 = 687/x
  3. Step 3: Cross multiply
    1,662.24x = 2,491.20 × 687
  4. Step 4: Simplify right side
    1,662.24x = 1,711,454.40
  5. Step 5: Solve for x
    x = 1,711,454.40/1,662.24
  6. Step 6: Final answer
    x = 1,029.61

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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.