Home / 20,942.35-31,405.32-7,787.54

Finding the Fourth Proportional to 20,942.35, 31,405.32 and 7,787.54

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Solution

The fourth proportional to 20,942.35, 31,405.32 and 7,787.54 is: 11,678.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,942.35 : 31,405.32 = 7,787.54 : x
  2. Step 2: Convert to fraction form
    20,942.35/31,405.32 = 7,787.54/x
  3. Step 3: Cross multiply
    20,942.35x = 31,405.32 × 7,787.54
  4. Step 4: Simplify right side
    20,942.35x = 244,570,264.23
  5. Step 5: Solve for x
    x = 244,570,264.23/20,942.35
  6. Step 6: Final answer
    x = 11,678.26

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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.