Home / 13,426.90-20,121.15-9,889.30

Finding the Fourth Proportional to 13,426.90, 20,121.15 and 9,889.30

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Solution

The fourth proportional to 13,426.90, 20,121.15 and 9,889.30 is: 14,819.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,426.90 : 20,121.15 = 9,889.30 : x
  2. Step 2: Convert to fraction form
    13,426.90/20,121.15 = 9,889.30/x
  3. Step 3: Cross multiply
    13,426.90x = 20,121.15 × 9,889.30
  4. Step 4: Simplify right side
    13,426.90x = 198,984,088.70
  5. Step 5: Solve for x
    x = 198,984,088.70/13,426.90
  6. Step 6: Final answer
    x = 14,819.81

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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.