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Finding the Fourth Proportional to 789.52, 1,089.84 and 556.96

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Solution

The fourth proportional to 789.52, 1,089.84 and 556.96 is: 768.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.52 : 1,089.84 = 556.96 : x
  2. Step 2: Convert to fraction form
    789.52/1,089.84 = 556.96/x
  3. Step 3: Cross multiply
    789.52x = 1,089.84 × 556.96
  4. Step 4: Simplify right side
    789.52x = 606,997.29
  5. Step 5: Solve for x
    x = 606,997.29/789.52
  6. Step 6: Final answer
    x = 768.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.