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Finding the Fourth Proportional to 85,640.60, 128,566.20 and 54,050.60

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Solution

The fourth proportional to 85,640.60, 128,566.20 and 54,050.60 is: 81,142.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,640.60 : 128,566.20 = 54,050.60 : x
  2. Step 2: Convert to fraction form
    85,640.60/128,566.20 = 54,050.60/x
  3. Step 3: Cross multiply
    85,640.60x = 128,566.20 × 54,050.60
  4. Step 4: Simplify right side
    85,640.60x = 6,949,080,249.72
  5. Step 5: Solve for x
    x = 6,949,080,249.72/85,640.60
  6. Step 6: Final answer
    x = 81,142.36

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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.