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Finding the Fourth Proportional to 18,928.08, 28,389.84 and 5,078.16

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Solution

The fourth proportional to 18,928.08, 28,389.84 and 5,078.16 is: 7,616.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,928.08 : 28,389.84 = 5,078.16 : x
  2. Step 2: Convert to fraction form
    18,928.08/28,389.84 = 5,078.16/x
  3. Step 3: Cross multiply
    18,928.08x = 28,389.84 × 5,078.16
  4. Step 4: Simplify right side
    18,928.08x = 144,168,149.89
  5. Step 5: Solve for x
    x = 144,168,149.89/18,928.08
  6. Step 6: Final answer
    x = 7,616.63

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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.