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Finding the Fourth Proportional to 18,821.16, 28,227.42 and 7,132.86

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Solution

The fourth proportional to 18,821.16, 28,227.42 and 7,132.86 is: 10,697.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,821.16 : 28,227.42 = 7,132.86 : x
  2. Step 2: Convert to fraction form
    18,821.16/28,227.42 = 7,132.86/x
  3. Step 3: Cross multiply
    18,821.16x = 28,227.42 × 7,132.86
  4. Step 4: Simplify right side
    18,821.16x = 201,342,235.02
  5. Step 5: Solve for x
    x = 201,342,235.02/18,821.16
  6. Step 6: Final answer
    x = 10,697.65

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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.