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Finding the Fourth Proportional to 693.76, 1,040.81 and 260.92

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Solution

The fourth proportional to 693.76, 1,040.81 and 260.92 is: 391.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.76 : 1,040.81 = 260.92 : x
  2. Step 2: Convert to fraction form
    693.76/1,040.81 = 260.92/x
  3. Step 3: Cross multiply
    693.76x = 1,040.81 × 260.92
  4. Step 4: Simplify right side
    693.76x = 271,568.15
  5. Step 5: Solve for x
    x = 271,568.15/693.76
  6. Step 6: Final answer
    x = 391.44

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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.