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Finding the Fourth Proportional to 18,808.38, 28,046.81 and 18,639.74

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Solution

The fourth proportional to 18,808.38, 28,046.81 and 18,639.74 is: 27,795.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,808.38 : 28,046.81 = 18,639.74 : x
  2. Step 2: Convert to fraction form
    18,808.38/28,046.81 = 18,639.74/x
  3. Step 3: Cross multiply
    18,808.38x = 28,046.81 × 18,639.74
  4. Step 4: Simplify right side
    18,808.38x = 522,785,012.80
  5. Step 5: Solve for x
    x = 522,785,012.80/18,808.38
  6. Step 6: Final answer
    x = 27,795.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.