Home / 20,787.60-31,181.40-6,747.60

Finding the Fourth Proportional to 20,787.60, 31,181.40 and 6,747.60

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Solution

The fourth proportional to 20,787.60, 31,181.40 and 6,747.60 is: 10,121.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,787.60 : 31,181.40 = 6,747.60 : x
  2. Step 2: Convert to fraction form
    20,787.60/31,181.40 = 6,747.60/x
  3. Step 3: Cross multiply
    20,787.60x = 31,181.40 × 6,747.60
  4. Step 4: Simplify right side
    20,787.60x = 210,399,614.64
  5. Step 5: Solve for x
    x = 210,399,614.64/20,787.60
  6. Step 6: Final answer
    x = 10,121.40

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1.5x scale

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.