Home / 20,396.28-30,590.78-12,978.72

Finding the Fourth Proportional to 20,396.28, 30,590.78 and 12,978.72

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Solution

The fourth proportional to 20,396.28, 30,590.78 and 12,978.72 is: 19,465.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,396.28 : 30,590.78 = 12,978.72 : x
  2. Step 2: Convert to fraction form
    20,396.28/30,590.78 = 12,978.72/x
  3. Step 3: Cross multiply
    20,396.28x = 30,590.78 × 12,978.72
  4. Step 4: Simplify right side
    20,396.28x = 397,029,168.20
  5. Step 5: Solve for x
    x = 397,029,168.20/20,396.28
  6. Step 6: Final answer
    x = 19,465.76

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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.