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Finding the Fourth Proportional to 889.96, 1,336.66 and 725.55

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Solution

The fourth proportional to 889.96, 1,336.66 and 725.55 is: 1,089.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.96 : 1,336.66 = 725.55 : x
  2. Step 2: Convert to fraction form
    889.96/1,336.66 = 725.55/x
  3. Step 3: Cross multiply
    889.96x = 1,336.66 × 725.55
  4. Step 4: Simplify right side
    889.96x = 969,806.98
  5. Step 5: Solve for x
    x = 969,806.98/889.96
  6. Step 6: Final answer
    x = 1,089.73

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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.