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Finding the Fourth Proportional to 28,115.81, 42,152.87 and 17,019.87

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Solution

The fourth proportional to 28,115.81, 42,152.87 and 17,019.87 is: 25,517.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,115.81 : 42,152.87 = 17,019.87 : x
  2. Step 2: Convert to fraction form
    28,115.81/42,152.87 = 17,019.87/x
  3. Step 3: Cross multiply
    28,115.81x = 42,152.87 × 17,019.87
  4. Step 4: Simplify right side
    28,115.81x = 717,436,410.08
  5. Step 5: Solve for x
    x = 717,436,410.08/28,115.81
  6. Step 6: Final answer
    x = 25,517.19

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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.