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Finding the Fourth Proportional to 272,910.40, 409,365.60 and 85,921.90

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Solution

The fourth proportional to 272,910.40, 409,365.60 and 85,921.90 is: 128,882.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    272,910.40 : 409,365.60 = 85,921.90 : x
  2. Step 2: Convert to fraction form
    272,910.40/409,365.60 = 85,921.90/x
  3. Step 3: Cross multiply
    272,910.40x = 409,365.60 × 85,921.90
  4. Step 4: Simplify right side
    272,910.40x = 35,173,470,146.64
  5. Step 5: Solve for x
    x = 35,173,470,146.64/272,910.40
  6. Step 6: Final answer
    x = 128,882.85

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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.