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Finding the Fourth Proportional to 76,979.70, 115,469.55 and 66,482.10

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Solution

The fourth proportional to 76,979.70, 115,469.55 and 66,482.10 is: 99,723.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,979.70 : 115,469.55 = 66,482.10 : x
  2. Step 2: Convert to fraction form
    76,979.70/115,469.55 = 66,482.10/x
  3. Step 3: Cross multiply
    76,979.70x = 115,469.55 × 66,482.10
  4. Step 4: Simplify right side
    76,979.70x = 7,676,658,170.06
  5. Step 5: Solve for x
    x = 7,676,658,170.06/76,979.70
  6. Step 6: Final answer
    x = 99,723.15

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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.