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Finding the Fourth Proportional to 18,724.95, 28,070.97 and 7,640.97

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Solution

The fourth proportional to 18,724.95, 28,070.97 and 7,640.97 is: 11,454.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,724.95 : 28,070.97 = 7,640.97 : x
  2. Step 2: Convert to fraction form
    18,724.95/28,070.97 = 7,640.97/x
  3. Step 3: Cross multiply
    18,724.95x = 28,070.97 × 7,640.97
  4. Step 4: Simplify right side
    18,724.95x = 214,489,439.64
  5. Step 5: Solve for x
    x = 214,489,439.64/18,724.95
  6. Step 6: Final answer
    x = 11,454.74

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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.