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Finding the Fourth Proportional to 1,469.82, 2,202.80 and 689.70

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Solution

The fourth proportional to 1,469.82, 2,202.80 and 689.70 is: 1,033.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,469.82 : 2,202.80 = 689.70 : x
  2. Step 2: Convert to fraction form
    1,469.82/2,202.80 = 689.70/x
  3. Step 3: Cross multiply
    1,469.82x = 2,202.80 × 689.70
  4. Step 4: Simplify right side
    1,469.82x = 1,519,267.71
  5. Step 5: Solve for x
    x = 1,519,267.71/1,469.82
  6. Step 6: Final answer
    x = 1,033.64

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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.