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Finding the Fourth Proportional to 689.29, 1,033.36 and 278.30

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Solution

The fourth proportional to 689.29, 1,033.36 and 278.30 is: 417.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.29 : 1,033.36 = 278.30 : x
  2. Step 2: Convert to fraction form
    689.29/1,033.36 = 278.30/x
  3. Step 3: Cross multiply
    689.29x = 1,033.36 × 278.30
  4. Step 4: Simplify right side
    689.29x = 287,585.98
  5. Step 5: Solve for x
    x = 287,585.98/689.29
  6. Step 6: Final answer
    x = 417.22

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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.