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Finding the Fourth Proportional to 135,602.20, 203,403.30 and 85,835.80

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Solution

The fourth proportional to 135,602.20, 203,403.30 and 85,835.80 is: 128,753.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,602.20 : 203,403.30 = 85,835.80 : x
  2. Step 2: Convert to fraction form
    135,602.20/203,403.30 = 85,835.80/x
  3. Step 3: Cross multiply
    135,602.20x = 203,403.30 × 85,835.80
  4. Step 4: Simplify right side
    135,602.20x = 17,459,284,978.14
  5. Step 5: Solve for x
    x = 17,459,284,978.14/135,602.20
  6. Step 6: Final answer
    x = 128,753.70

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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.