Home / 20,438.11-28,207.20-12,478.65

Finding the Fourth Proportional to 20,438.11, 28,207.20 and 12,478.65

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Solution

The fourth proportional to 20,438.11, 28,207.20 and 12,478.65 is: 17,222.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,438.11 : 28,207.20 = 12,478.65 : x
  2. Step 2: Convert to fraction form
    20,438.11/28,207.20 = 12,478.65/x
  3. Step 3: Cross multiply
    20,438.11x = 28,207.20 × 12,478.65
  4. Step 4: Simplify right side
    20,438.11x = 351,987,776.28
  5. Step 5: Solve for x
    x = 351,987,776.28/20,438.11
  6. Step 6: Final answer
    x = 17,222.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.