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Finding the Fourth Proportional to 156,311.70, 215,708.46 and 84,687.48

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Solution

The fourth proportional to 156,311.70, 215,708.46 and 84,687.48 is: 116,867.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,311.70 : 215,708.46 = 84,687.48 : x
  2. Step 2: Convert to fraction form
    156,311.70/215,708.46 = 84,687.48/x
  3. Step 3: Cross multiply
    156,311.70x = 215,708.46 × 84,687.48
  4. Step 4: Simplify right side
    156,311.70x = 18,267,805,892.08
  5. Step 5: Solve for x
    x = 18,267,805,892.08/156,311.70
  6. Step 6: Final answer
    x = 116,867.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.