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Finding the Fourth Proportional to 18,458.80, 27,688.20 and 12,821.20

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Solution

The fourth proportional to 18,458.80, 27,688.20 and 12,821.20 is: 19,231.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,458.80 : 27,688.20 = 12,821.20 : x
  2. Step 2: Convert to fraction form
    18,458.80/27,688.20 = 12,821.20/x
  3. Step 3: Cross multiply
    18,458.80x = 27,688.20 × 12,821.20
  4. Step 4: Simplify right side
    18,458.80x = 354,995,949.84
  5. Step 5: Solve for x
    x = 354,995,949.84/18,458.80
  6. Step 6: Final answer
    x = 19,231.80

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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.