Home / 21,121.19-31,688.10-12,234.44

Finding the Fourth Proportional to 21,121.19, 31,688.10 and 12,234.44

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Solution

The fourth proportional to 21,121.19, 31,688.10 and 12,234.44 is: 18,355.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.19 : 31,688.10 = 12,234.44 : x
  2. Step 2: Convert to fraction form
    21,121.19/31,688.10 = 12,234.44/x
  3. Step 3: Cross multiply
    21,121.19x = 31,688.10 × 12,234.44
  4. Step 4: Simplify right side
    21,121.19x = 387,686,237.38
  5. Step 5: Solve for x
    x = 387,686,237.38/21,121.19
  6. Step 6: Final answer
    x = 18,355.33

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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.