Home / 20,815.20-31,224.85-7,664.49

Finding the Fourth Proportional to 20,815.20, 31,224.85 and 7,664.49

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Solution

The fourth proportional to 20,815.20, 31,224.85 and 7,664.49 is: 11,497.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,815.20 : 31,224.85 = 7,664.49 : x
  2. Step 2: Convert to fraction form
    20,815.20/31,224.85 = 7,664.49/x
  3. Step 3: Cross multiply
    20,815.20x = 31,224.85 × 7,664.49
  4. Step 4: Simplify right side
    20,815.20x = 239,322,531.42
  5. Step 5: Solve for x
    x = 239,322,531.42/20,815.20
  6. Step 6: Final answer
    x = 11,497.49

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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.