Home / 20,919.50-31,376.95-6,128.56

Finding the Fourth Proportional to 20,919.50, 31,376.95 and 6,128.56

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Solution

The fourth proportional to 20,919.50, 31,376.95 and 6,128.56 is: 9,192.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,919.50 : 31,376.95 = 6,128.56 : x
  2. Step 2: Convert to fraction form
    20,919.50/31,376.95 = 6,128.56/x
  3. Step 3: Cross multiply
    20,919.50x = 31,376.95 × 6,128.56
  4. Step 4: Simplify right side
    20,919.50x = 192,295,520.69
  5. Step 5: Solve for x
    x = 192,295,520.69/20,919.50
  6. Step 6: Final answer
    x = 9,192.17

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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.