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Finding the Fourth Proportional to 135,615.70, 203,423.55 and 129,856.60

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Solution

The fourth proportional to 135,615.70, 203,423.55 and 129,856.60 is: 194,784.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,615.70 : 203,423.55 = 129,856.60 : x
  2. Step 2: Convert to fraction form
    135,615.70/203,423.55 = 129,856.60/x
  3. Step 3: Cross multiply
    135,615.70x = 203,423.55 × 129,856.60
  4. Step 4: Simplify right side
    135,615.70x = 26,415,890,562.93
  5. Step 5: Solve for x
    x = 26,415,890,562.93/135,615.70
  6. Step 6: Final answer
    x = 194,784.90

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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.