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Finding the Fourth Proportional to 3,281.15, 4,921.47 and 815.96

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Solution

The fourth proportional to 3,281.15, 4,921.47 and 815.96 is: 1,223.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,281.15 : 4,921.47 = 815.96 : x
  2. Step 2: Convert to fraction form
    3,281.15/4,921.47 = 815.96/x
  3. Step 3: Cross multiply
    3,281.15x = 4,921.47 × 815.96
  4. Step 4: Simplify right side
    3,281.15x = 4,015,729.19
  5. Step 5: Solve for x
    x = 4,015,729.19/3,281.15
  6. Step 6: Final answer
    x = 1,223.88

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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.