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Finding the Fourth Proportional to 18,894.32, 28,331.04 and 7,639.52

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Solution

The fourth proportional to 18,894.32, 28,331.04 and 7,639.52 is: 11,455.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,894.32 : 28,331.04 = 7,639.52 : x
  2. Step 2: Convert to fraction form
    18,894.32/28,331.04 = 7,639.52/x
  3. Step 3: Cross multiply
    18,894.32x = 28,331.04 × 7,639.52
  4. Step 4: Simplify right side
    18,894.32x = 216,435,546.70
  5. Step 5: Solve for x
    x = 216,435,546.70/18,894.32
  6. Step 6: Final answer
    x = 11,455.06

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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.