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Finding the Fourth Proportional to 18,900.84, 28,338.96 and 9,039.84

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Solution

The fourth proportional to 18,900.84, 28,338.96 and 9,039.84 is: 13,553.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,900.84 : 28,338.96 = 9,039.84 : x
  2. Step 2: Convert to fraction form
    18,900.84/28,338.96 = 9,039.84/x
  3. Step 3: Cross multiply
    18,900.84x = 28,338.96 × 9,039.84
  4. Step 4: Simplify right side
    18,900.84x = 256,179,664.17
  5. Step 5: Solve for x
    x = 256,179,664.17/18,900.84
  6. Step 6: Final answer
    x = 13,553.88

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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.