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Finding the Fourth Proportional to 18,821.93, 28,218.31 and 10,912.28

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Solution

The fourth proportional to 18,821.93, 28,218.31 and 10,912.28 is: 16,359.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,821.93 : 28,218.31 = 10,912.28 : x
  2. Step 2: Convert to fraction form
    18,821.93/28,218.31 = 10,912.28/x
  3. Step 3: Cross multiply
    18,821.93x = 28,218.31 × 10,912.28
  4. Step 4: Simplify right side
    18,821.93x = 307,925,931.47
  5. Step 5: Solve for x
    x = 307,925,931.47/18,821.93
  6. Step 6: Final answer
    x = 16,359.96

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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.