Home / 21,285.92-31,930.81-8,138.41

Finding the Fourth Proportional to 21,285.92, 31,930.81 and 8,138.41

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Solution

The fourth proportional to 21,285.92, 31,930.81 and 8,138.41 is: 12,208.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,285.92 : 31,930.81 = 8,138.41 : x
  2. Step 2: Convert to fraction form
    21,285.92/31,930.81 = 8,138.41/x
  3. Step 3: Cross multiply
    21,285.92x = 31,930.81 × 8,138.41
  4. Step 4: Simplify right side
    21,285.92x = 259,865,923.24
  5. Step 5: Solve for x
    x = 259,865,923.24/21,285.92
  6. Step 6: Final answer
    x = 12,208.35

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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.