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Finding the Fourth Proportional to 12,819.60, 19,229.40 and 12,139.20

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Solution

The fourth proportional to 12,819.60, 19,229.40 and 12,139.20 is: 18,208.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,819.60 : 19,229.40 = 12,139.20 : x
  2. Step 2: Convert to fraction form
    12,819.60/19,229.40 = 12,139.20/x
  3. Step 3: Cross multiply
    12,819.60x = 19,229.40 × 12,139.20
  4. Step 4: Simplify right side
    12,819.60x = 233,429,532.48
  5. Step 5: Solve for x
    x = 233,429,532.48/12,819.60
  6. Step 6: Final answer
    x = 18,208.80

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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.