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Finding the Fourth Proportional to 135,707.20, 203,560.80 and 100,715.20

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Solution

The fourth proportional to 135,707.20, 203,560.80 and 100,715.20 is: 151,072.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,707.20 : 203,560.80 = 100,715.20 : x
  2. Step 2: Convert to fraction form
    135,707.20/203,560.80 = 100,715.20/x
  3. Step 3: Cross multiply
    135,707.20x = 203,560.80 × 100,715.20
  4. Step 4: Simplify right side
    135,707.20x = 20,501,666,684.16
  5. Step 5: Solve for x
    x = 20,501,666,684.16/135,707.20
  6. Step 6: Final answer
    x = 151,072.80

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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.