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Finding the Fourth Proportional to 689.98, 1,034.74 and 279.02

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Solution

The fourth proportional to 689.98, 1,034.74 and 279.02 is: 418.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.98 : 1,034.74 = 279.02 : x
  2. Step 2: Convert to fraction form
    689.98/1,034.74 = 279.02/x
  3. Step 3: Cross multiply
    689.98x = 1,034.74 × 279.02
  4. Step 4: Simplify right side
    689.98x = 288,713.15
  5. Step 5: Solve for x
    x = 288,713.15/689.98
  6. Step 6: Final answer
    x = 418.44

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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.