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Finding the Fourth Proportional to 790.70, 1,089.05 and 725.09

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Solution

The fourth proportional to 790.70, 1,089.05 and 725.09 is: 998.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.70 : 1,089.05 = 725.09 : x
  2. Step 2: Convert to fraction form
    790.70/1,089.05 = 725.09/x
  3. Step 3: Cross multiply
    790.70x = 1,089.05 × 725.09
  4. Step 4: Simplify right side
    790.70x = 789,650.19
  5. Step 5: Solve for x
    x = 789,650.19/790.70
  6. Step 6: Final answer
    x = 998.68

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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.