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Finding the Fourth Proportional to 8,643.34, 11,928.05 and 5,286.09

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Solution

The fourth proportional to 8,643.34, 11,928.05 and 5,286.09 is: 7,294.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,643.34 : 11,928.05 = 5,286.09 : x
  2. Step 2: Convert to fraction form
    8,643.34/11,928.05 = 5,286.09/x
  3. Step 3: Cross multiply
    8,643.34x = 11,928.05 × 5,286.09
  4. Step 4: Simplify right side
    8,643.34x = 63,052,783.95
  5. Step 5: Solve for x
    x = 63,052,783.95/8,643.34
  6. Step 6: Final answer
    x = 7,294.95

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.