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Finding the Fourth Proportional to 85,811.60, 128,640.60 and 33,203.60

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Solution

The fourth proportional to 85,811.60, 128,640.60 and 33,203.60 is: 49,775.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,811.60 : 128,640.60 = 33,203.60 : x
  2. Step 2: Convert to fraction form
    85,811.60/128,640.60 = 33,203.60/x
  3. Step 3: Cross multiply
    85,811.60x = 128,640.60 × 33,203.60
  4. Step 4: Simplify right side
    85,811.60x = 4,271,331,026.16
  5. Step 5: Solve for x
    x = 4,271,331,026.16/85,811.60
  6. Step 6: Final answer
    x = 49,775.68

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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.