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Finding the Fourth Proportional to 826.61, 1,138.93 and 693.36

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Solution

The fourth proportional to 826.61, 1,138.93 and 693.36 is: 955.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.61 : 1,138.93 = 693.36 : x
  2. Step 2: Convert to fraction form
    826.61/1,138.93 = 693.36/x
  3. Step 3: Cross multiply
    826.61x = 1,138.93 × 693.36
  4. Step 4: Simplify right side
    826.61x = 789,686.77
  5. Step 5: Solve for x
    x = 789,686.77/826.61
  6. Step 6: Final answer
    x = 955.34

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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.