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Finding the Fourth Proportional to 789.30, 1,089.62 and 611.86

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Solution

The fourth proportional to 789.30, 1,089.62 and 611.86 is: 844.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.30 : 1,089.62 = 611.86 : x
  2. Step 2: Convert to fraction form
    789.30/1,089.62 = 611.86/x
  3. Step 3: Cross multiply
    789.30x = 1,089.62 × 611.86
  4. Step 4: Simplify right side
    789.30x = 666,694.89
  5. Step 5: Solve for x
    x = 666,694.89/789.30
  6. Step 6: Final answer
    x = 844.67

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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.