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Finding the Fourth Proportional to 694.85, 1,042.28 and 278.57

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Solution

The fourth proportional to 694.85, 1,042.28 and 278.57 is: 417.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.85 : 1,042.28 = 278.57 : x
  2. Step 2: Convert to fraction form
    694.85/1,042.28 = 278.57/x
  3. Step 3: Cross multiply
    694.85x = 1,042.28 × 278.57
  4. Step 4: Simplify right side
    694.85x = 290,345.24
  5. Step 5: Solve for x
    x = 290,345.24/694.85
  6. Step 6: Final answer
    x = 417.85

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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.