Home / 20,423.12-30,631.32-12,679.76

Finding the Fourth Proportional to 20,423.12, 30,631.32 and 12,679.76

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Solution

The fourth proportional to 20,423.12, 30,631.32 and 12,679.76 is: 19,017.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,423.12 : 30,631.32 = 12,679.76 : x
  2. Step 2: Convert to fraction form
    20,423.12/30,631.32 = 12,679.76/x
  3. Step 3: Cross multiply
    20,423.12x = 30,631.32 × 12,679.76
  4. Step 4: Simplify right side
    20,423.12x = 388,397,786.08
  5. Step 5: Solve for x
    x = 388,397,786.08/20,423.12
  6. Step 6: Final answer
    x = 19,017.55

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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.