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Finding the Fourth Proportional to 689.93, 1,034.15 and 278.85

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Solution

The fourth proportional to 689.93, 1,034.15 and 278.85 is: 417.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.93 : 1,034.15 = 278.85 : x
  2. Step 2: Convert to fraction form
    689.93/1,034.15 = 278.85/x
  3. Step 3: Cross multiply
    689.93x = 1,034.15 × 278.85
  4. Step 4: Simplify right side
    689.93x = 288,371.33
  5. Step 5: Solve for x
    x = 288,371.33/689.93
  6. Step 6: Final answer
    x = 417.97

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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.