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Finding the Fourth Proportional to 18,821.70, 28,232.55 and 7,134.30

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Solution

The fourth proportional to 18,821.70, 28,232.55 and 7,134.30 is: 10,701.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,821.70 : 28,232.55 = 7,134.30 : x
  2. Step 2: Convert to fraction form
    18,821.70/28,232.55 = 7,134.30/x
  3. Step 3: Cross multiply
    18,821.70x = 28,232.55 × 7,134.30
  4. Step 4: Simplify right side
    18,821.70x = 201,419,481.47
  5. Step 5: Solve for x
    x = 201,419,481.47/18,821.70
  6. Step 6: Final answer
    x = 10,701.45

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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.