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Finding the Fourth Proportional to 156,990.60, 217,217.52 and 136,889.40

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Solution

The fourth proportional to 156,990.60, 217,217.52 and 136,889.40 is: 189,404.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,990.60 : 217,217.52 = 136,889.40 : x
  2. Step 2: Convert to fraction form
    156,990.60/217,217.52 = 136,889.40/x
  3. Step 3: Cross multiply
    156,990.60x = 217,217.52 × 136,889.40
  4. Step 4: Simplify right side
    156,990.60x = 29,734,775,982.29
  5. Step 5: Solve for x
    x = 29,734,775,982.29/156,990.60
  6. Step 6: Final answer
    x = 189,404.82

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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.