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Finding the Fourth Proportional to 19,336.80, 28,981.80 and 8,220.15

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Solution

The fourth proportional to 19,336.80, 28,981.80 and 8,220.15 is: 12,320.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,336.80 : 28,981.80 = 8,220.15 : x
  2. Step 2: Convert to fraction form
    19,336.80/28,981.80 = 8,220.15/x
  3. Step 3: Cross multiply
    19,336.80x = 28,981.80 × 8,220.15
  4. Step 4: Simplify right side
    19,336.80x = 238,234,743.27
  5. Step 5: Solve for x
    x = 238,234,743.27/19,336.80
  6. Step 6: Final answer
    x = 12,320.28

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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.