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Finding the Fourth Proportional to 18,948.80, 28,411.05 and 7,863.14

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Solution

The fourth proportional to 18,948.80, 28,411.05 and 7,863.14 is: 11,789.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,948.80 : 28,411.05 = 7,863.14 : x
  2. Step 2: Convert to fraction form
    18,948.80/28,411.05 = 7,863.14/x
  3. Step 3: Cross multiply
    18,948.80x = 28,411.05 × 7,863.14
  4. Step 4: Simplify right side
    18,948.80x = 223,399,938.05
  5. Step 5: Solve for x
    x = 223,399,938.05/18,948.80
  6. Step 6: Final answer
    x = 11,789.66

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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.