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Finding the Fourth Proportional to 18,870.82, 28,306.19 and 5,019.82

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Solution

The fourth proportional to 18,870.82, 28,306.19 and 5,019.82 is: 7,529.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,870.82 : 28,306.19 = 5,019.82 : x
  2. Step 2: Convert to fraction form
    18,870.82/28,306.19 = 5,019.82/x
  3. Step 3: Cross multiply
    18,870.82x = 28,306.19 × 5,019.82
  4. Step 4: Simplify right side
    18,870.82x = 142,091,978.69
  5. Step 5: Solve for x
    x = 142,091,978.69/18,870.82
  6. Step 6: Final answer
    x = 7,529.72

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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.