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Finding the Fourth Proportional to 689.55, 1,034.04 and 278.58

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Solution

The fourth proportional to 689.55, 1,034.04 and 278.58 is: 417.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.55 : 1,034.04 = 278.58 : x
  2. Step 2: Convert to fraction form
    689.55/1,034.04 = 278.58/x
  3. Step 3: Cross multiply
    689.55x = 1,034.04 × 278.58
  4. Step 4: Simplify right side
    689.55x = 288,062.86
  5. Step 5: Solve for x
    x = 288,062.86/689.55
  6. Step 6: Final answer
    x = 417.75

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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.