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Finding the Fourth Proportional to 76,145.40, 113,958.90 and 66,814.20

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Solution

The fourth proportional to 76,145.40, 113,958.90 and 66,814.20 is: 99,993.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,145.40 : 113,958.90 = 66,814.20 : x
  2. Step 2: Convert to fraction form
    76,145.40/113,958.90 = 66,814.20/x
  3. Step 3: Cross multiply
    76,145.40x = 113,958.90 × 66,814.20
  4. Step 4: Simplify right side
    76,145.40x = 7,614,072,736.38
  5. Step 5: Solve for x
    x = 7,614,072,736.38/76,145.40
  6. Step 6: Final answer
    x = 99,993.86

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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.