Home / 20,919.24-31,376.58-6,128.30

Finding the Fourth Proportional to 20,919.24, 31,376.58 and 6,128.30

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Solution

The fourth proportional to 20,919.24, 31,376.58 and 6,128.30 is: 9,191.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,919.24 : 31,376.58 = 6,128.30 : x
  2. Step 2: Convert to fraction form
    20,919.24/31,376.58 = 6,128.30/x
  3. Step 3: Cross multiply
    20,919.24x = 31,376.58 × 6,128.30
  4. Step 4: Simplify right side
    20,919.24x = 192,285,095.21
  5. Step 5: Solve for x
    x = 192,285,095.21/20,919.24
  6. Step 6: Final answer
    x = 9,191.78

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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.