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Finding the Fourth Proportional to 19,221.60, 28,836.18 and 8,128.20

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Solution

The fourth proportional to 19,221.60, 28,836.18 and 8,128.20 is: 12,193.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,221.60 : 28,836.18 = 8,128.20 : x
  2. Step 2: Convert to fraction form
    19,221.60/28,836.18 = 8,128.20/x
  3. Step 3: Cross multiply
    19,221.60x = 28,836.18 × 8,128.20
  4. Step 4: Simplify right side
    19,221.60x = 234,386,238.28
  5. Step 5: Solve for x
    x = 234,386,238.28/19,221.60
  6. Step 6: Final answer
    x = 12,193.90

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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.