Home / 20,830.64-31,249.20-6,787.40

Finding the Fourth Proportional to 20,830.64, 31,249.20 and 6,787.40

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Solution

The fourth proportional to 20,830.64, 31,249.20 and 6,787.40 is: 10,182.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,830.64 : 31,249.20 = 6,787.40 : x
  2. Step 2: Convert to fraction form
    20,830.64/31,249.20 = 6,787.40/x
  3. Step 3: Cross multiply
    20,830.64x = 31,249.20 × 6,787.40
  4. Step 4: Simplify right side
    20,830.64x = 212,100,629.90
  5. Step 5: Solve for x
    x = 212,100,629.90/20,830.64
  6. Step 6: Final answer
    x = 10,182.15

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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.