Home / 20,787.56-31,161.89-7,636.40

Finding the Fourth Proportional to 20,787.56, 31,161.89 and 7,636.40

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Solution

The fourth proportional to 20,787.56, 31,161.89 and 7,636.40 is: 11,447.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,787.56 : 31,161.89 = 7,636.40 : x
  2. Step 2: Convert to fraction form
    20,787.56/31,161.89 = 7,636.40/x
  3. Step 3: Cross multiply
    20,787.56x = 31,161.89 × 7,636.40
  4. Step 4: Simplify right side
    20,787.56x = 237,964,520.08
  5. Step 5: Solve for x
    x = 237,964,520.08/20,787.56
  6. Step 6: Final answer
    x = 11,447.45

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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.