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Finding the Fourth Proportional to 211,247.60, 316,986.60 and 86,601.20

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Solution

The fourth proportional to 211,247.60, 316,986.60 and 86,601.20 is: 129,949.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    211,247.60 : 316,986.60 = 86,601.20 : x
  2. Step 2: Convert to fraction form
    211,247.60/316,986.60 = 86,601.20/x
  3. Step 3: Cross multiply
    211,247.60x = 316,986.60 × 86,601.20
  4. Step 4: Simplify right side
    211,247.60x = 27,451,419,943.92
  5. Step 5: Solve for x
    x = 27,451,419,943.92/211,247.60
  6. Step 6: Final answer
    x = 129,949.03

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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.