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Finding the Fourth Proportional to 76,979.60, 115,469.40 and 21,568.40

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Solution

The fourth proportional to 76,979.60, 115,469.40 and 21,568.40 is: 32,352.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,979.60 : 115,469.40 = 21,568.40 : x
  2. Step 2: Convert to fraction form
    76,979.60/115,469.40 = 21,568.40/x
  3. Step 3: Cross multiply
    76,979.60x = 115,469.40 × 21,568.40
  4. Step 4: Simplify right side
    76,979.60x = 2,490,490,206.96
  5. Step 5: Solve for x
    x = 2,490,490,206.96/76,979.60
  6. Step 6: Final answer
    x = 32,352.60

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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.