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Finding the Fourth Proportional to 14,139.70, 21,209.55 and 7,213.30

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Solution

The fourth proportional to 14,139.70, 21,209.55 and 7,213.30 is: 10,819.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,139.70 : 21,209.55 = 7,213.30 : x
  2. Step 2: Convert to fraction form
    14,139.70/21,209.55 = 7,213.30/x
  3. Step 3: Cross multiply
    14,139.70x = 21,209.55 × 7,213.30
  4. Step 4: Simplify right side
    14,139.70x = 152,990,847.02
  5. Step 5: Solve for x
    x = 152,990,847.02/14,139.70
  6. Step 6: Final answer
    x = 10,819.95

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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.