Home / 20,984.78-31,465.66-8,321.71

Finding the Fourth Proportional to 20,984.78, 31,465.66 and 8,321.71

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Solution

The fourth proportional to 20,984.78, 31,465.66 and 8,321.71 is: 12,478.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,984.78 : 31,465.66 = 8,321.71 : x
  2. Step 2: Convert to fraction form
    20,984.78/31,465.66 = 8,321.71/x
  3. Step 3: Cross multiply
    20,984.78x = 31,465.66 × 8,321.71
  4. Step 4: Simplify right side
    20,984.78x = 261,848,097.48
  5. Step 5: Solve for x
    x = 261,848,097.48/20,984.78
  6. Step 6: Final answer
    x = 12,478.00

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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.