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Finding the Fourth Proportional to 826.89, 1,238.70 and 621.69

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Solution

The fourth proportional to 826.89, 1,238.70 and 621.69 is: 931.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.89 : 1,238.70 = 621.69 : x
  2. Step 2: Convert to fraction form
    826.89/1,238.70 = 621.69/x
  3. Step 3: Cross multiply
    826.89x = 1,238.70 × 621.69
  4. Step 4: Simplify right side
    826.89x = 770,087.40
  5. Step 5: Solve for x
    x = 770,087.40/826.89
  6. Step 6: Final answer
    x = 931.31

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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.