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Finding the Fourth Proportional to 1,418.65, 2,128.17 and 687.62

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Solution

The fourth proportional to 1,418.65, 2,128.17 and 687.62 is: 1,031.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,418.65 : 2,128.17 = 687.62 : x
  2. Step 2: Convert to fraction form
    1,418.65/2,128.17 = 687.62/x
  3. Step 3: Cross multiply
    1,418.65x = 2,128.17 × 687.62
  4. Step 4: Simplify right side
    1,418.65x = 1,463,372.26
  5. Step 5: Solve for x
    x = 1,463,372.26/1,418.65
  6. Step 6: Final answer
    x = 1,031.52

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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.