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Finding the Fourth Proportional to 1,604.32, 2,406.81 and 911.31

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Solution

The fourth proportional to 1,604.32, 2,406.81 and 911.31 is: 1,367.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,604.32 : 2,406.81 = 911.31 : x
  2. Step 2: Convert to fraction form
    1,604.32/2,406.81 = 911.31/x
  3. Step 3: Cross multiply
    1,604.32x = 2,406.81 × 911.31
  4. Step 4: Simplify right side
    1,604.32x = 2,193,344.41
  5. Step 5: Solve for x
    x = 2,193,344.41/1,604.32
  6. Step 6: Final answer
    x = 1,367.15

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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.