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Finding the Fourth Proportional to 789.74, 1,089.12 and 523.72

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Solution

The fourth proportional to 789.74, 1,089.12 and 523.72 is: 722.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.74 : 1,089.12 = 523.72 : x
  2. Step 2: Convert to fraction form
    789.74/1,089.12 = 523.72/x
  3. Step 3: Cross multiply
    789.74x = 1,089.12 × 523.72
  4. Step 4: Simplify right side
    789.74x = 570,393.93
  5. Step 5: Solve for x
    x = 570,393.93/789.74
  6. Step 6: Final answer
    x = 722.26

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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.