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Finding the Fourth Proportional to 18,974.20, 28,453.20 and 7,877.20

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Solution

The fourth proportional to 18,974.20, 28,453.20 and 7,877.20 is: 11,812.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,974.20 : 28,453.20 = 7,877.20 : x
  2. Step 2: Convert to fraction form
    18,974.20/28,453.20 = 7,877.20/x
  3. Step 3: Cross multiply
    18,974.20x = 28,453.20 × 7,877.20
  4. Step 4: Simplify right side
    18,974.20x = 224,131,547.04
  5. Step 5: Solve for x
    x = 224,131,547.04/18,974.20
  6. Step 6: Final answer
    x = 11,812.44

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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.