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Finding the Fourth Proportional to 76,843.20, 115,264.62 and 21,439.20

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Solution

The fourth proportional to 76,843.20, 115,264.62 and 21,439.20 is: 32,158.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,843.20 : 115,264.62 = 21,439.20 : x
  2. Step 2: Convert to fraction form
    76,843.20/115,264.62 = 21,439.20/x
  3. Step 3: Cross multiply
    76,843.20x = 115,264.62 × 21,439.20
  4. Step 4: Simplify right side
    76,843.20x = 2,471,181,241.10
  5. Step 5: Solve for x
    x = 2,471,181,241.10/76,843.20
  6. Step 6: Final answer
    x = 32,158.75

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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.