Home / 21,188.81-31,787.78-7,149.20

Finding the Fourth Proportional to 21,188.81, 31,787.78 and 7,149.20

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Solution

The fourth proportional to 21,188.81, 31,787.78 and 7,149.20 is: 10,725.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,188.81 : 31,787.78 = 7,149.20 : x
  2. Step 2: Convert to fraction form
    21,188.81/31,787.78 = 7,149.20/x
  3. Step 3: Cross multiply
    21,188.81x = 31,787.78 × 7,149.20
  4. Step 4: Simplify right side
    21,188.81x = 227,257,002.09
  5. Step 5: Solve for x
    x = 227,257,002.09/21,188.81
  6. Step 6: Final answer
    x = 10,725.33

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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.