Home / 21,183.68-31,780.92-12,426.32

Finding the Fourth Proportional to 21,183.68, 31,780.92 and 12,426.32

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Solution

The fourth proportional to 21,183.68, 31,780.92 and 12,426.32 is: 18,642.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,183.68 : 31,780.92 = 12,426.32 : x
  2. Step 2: Convert to fraction form
    21,183.68/31,780.92 = 12,426.32/x
  3. Step 3: Cross multiply
    21,183.68x = 31,780.92 × 12,426.32
  4. Step 4: Simplify right side
    21,183.68x = 394,919,881.81
  5. Step 5: Solve for x
    x = 394,919,881.81/21,183.68
  6. Step 6: Final answer
    x = 18,642.65

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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.