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Finding the Fourth Proportional to 789.96, 1,089.90 and 528.24

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Solution

The fourth proportional to 789.96, 1,089.90 and 528.24 is: 728.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.96 : 1,089.90 = 528.24 : x
  2. Step 2: Convert to fraction form
    789.96/1,089.90 = 528.24/x
  3. Step 3: Cross multiply
    789.96x = 1,089.90 × 528.24
  4. Step 4: Simplify right side
    789.96x = 575,728.78
  5. Step 5: Solve for x
    x = 575,728.78/789.96
  6. Step 6: Final answer
    x = 728.81

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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.