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Finding the Fourth Proportional to 689.86, 1,034.80 and 553.78

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Solution

The fourth proportional to 689.86, 1,034.80 and 553.78 is: 830.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.86 : 1,034.80 = 553.78 : x
  2. Step 2: Convert to fraction form
    689.86/1,034.80 = 553.78/x
  3. Step 3: Cross multiply
    689.86x = 1,034.80 × 553.78
  4. Step 4: Simplify right side
    689.86x = 573,051.54
  5. Step 5: Solve for x
    x = 573,051.54/689.86
  6. Step 6: Final answer
    x = 830.68

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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.