Home / 689.03-1,034.28-278.45

Finding the Fourth Proportional to 689.03, 1,034.28 and 278.45

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Solution

The fourth proportional to 689.03, 1,034.28 and 278.45 is: 417.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.03 : 1,034.28 = 278.45 : x
  2. Step 2: Convert to fraction form
    689.03/1,034.28 = 278.45/x
  3. Step 3: Cross multiply
    689.03x = 1,034.28 × 278.45
  4. Step 4: Simplify right side
    689.03x = 287,995.27
  5. Step 5: Solve for x
    x = 287,995.27/689.03
  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.