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Finding the Fourth Proportional to 689.74, 1,034.13 and 552.75

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Solution

The fourth proportional to 689.74, 1,034.13 and 552.75 is: 828.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.74 : 1,034.13 = 552.75 : x
  2. Step 2: Convert to fraction form
    689.74/1,034.13 = 552.75/x
  3. Step 3: Cross multiply
    689.74x = 1,034.13 × 552.75
  4. Step 4: Simplify right side
    689.74x = 571,615.36
  5. Step 5: Solve for x
    x = 571,615.36/689.74
  6. Step 6: Final answer
    x = 828.74

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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.