Home / 20,219.20-30,328.80-12,856.30

Finding the Fourth Proportional to 20,219.20, 30,328.80 and 12,856.30

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Solution

The fourth proportional to 20,219.20, 30,328.80 and 12,856.30 is: 19,284.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,219.20 : 30,328.80 = 12,856.30 : x
  2. Step 2: Convert to fraction form
    20,219.20/30,328.80 = 12,856.30/x
  3. Step 3: Cross multiply
    20,219.20x = 30,328.80 × 12,856.30
  4. Step 4: Simplify right side
    20,219.20x = 389,916,151.44
  5. Step 5: Solve for x
    x = 389,916,151.44/20,219.20
  6. Step 6: Final answer
    x = 19,284.45

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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.