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Finding the Fourth Proportional to 18,820.65, 28,230.68 and 4,589.28

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Solution

The fourth proportional to 18,820.65, 28,230.68 and 4,589.28 is: 6,883.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,820.65 : 28,230.68 = 4,589.28 : x
  2. Step 2: Convert to fraction form
    18,820.65/28,230.68 = 4,589.28/x
  3. Step 3: Cross multiply
    18,820.65x = 28,230.68 × 4,589.28
  4. Step 4: Simplify right side
    18,820.65x = 129,558,472.16
  5. Step 5: Solve for x
    x = 129,558,472.16/18,820.65
  6. Step 6: Final answer
    x = 6,883.85

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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.