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Finding the Fourth Proportional to 1,662.42, 2,493.84 and 689.21

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Solution

The fourth proportional to 1,662.42, 2,493.84 and 689.21 is: 1,033.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,662.42 : 2,493.84 = 689.21 : x
  2. Step 2: Convert to fraction form
    1,662.42/2,493.84 = 689.21/x
  3. Step 3: Cross multiply
    1,662.42x = 2,493.84 × 689.21
  4. Step 4: Simplify right side
    1,662.42x = 1,718,779.47
  5. Step 5: Solve for x
    x = 1,718,779.47/1,662.42
  6. Step 6: Final answer
    x = 1,033.90

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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.