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Finding the Fourth Proportional to 689.90, 1,033.09 and 574.70

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Solution

The fourth proportional to 689.90, 1,033.09 and 574.70 is: 860.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.90 : 1,033.09 = 574.70 : x
  2. Step 2: Convert to fraction form
    689.90/1,033.09 = 574.70/x
  3. Step 3: Cross multiply
    689.90x = 1,033.09 × 574.70
  4. Step 4: Simplify right side
    689.90x = 593,716.82
  5. Step 5: Solve for x
    x = 593,716.82/689.90
  6. Step 6: Final answer
    x = 860.58

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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.