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Finding the Fourth Proportional to 18,618.63, 27,928.98 and 6,138.15

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Solution

The fourth proportional to 18,618.63, 27,928.98 and 6,138.15 is: 9,207.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,618.63 : 27,928.98 = 6,138.15 : x
  2. Step 2: Convert to fraction form
    18,618.63/27,928.98 = 6,138.15/x
  3. Step 3: Cross multiply
    18,618.63x = 27,928.98 × 6,138.15
  4. Step 4: Simplify right side
    18,618.63x = 171,432,268.59
  5. Step 5: Solve for x
    x = 171,432,268.59/18,618.63
  6. Step 6: Final answer
    x = 9,207.57

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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.