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Finding the Fourth Proportional to 135,620.60, 203,430.90 and 121,105.40

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Solution

The fourth proportional to 135,620.60, 203,430.90 and 121,105.40 is: 181,658.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,620.60 : 203,430.90 = 121,105.40 : x
  2. Step 2: Convert to fraction form
    135,620.60/203,430.90 = 121,105.40/x
  3. Step 3: Cross multiply
    135,620.60x = 203,430.90 × 121,105.40
  4. Step 4: Simplify right side
    135,620.60x = 24,636,580,516.86
  5. Step 5: Solve for x
    x = 24,636,580,516.86/135,620.60
  6. Step 6: Final answer
    x = 181,658.10

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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.