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Finding the Fourth Proportional to 85,311.60, 128,072.70 and 53,721.60

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Solution

The fourth proportional to 85,311.60, 128,072.70 and 53,721.60 is: 80,648.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,311.60 : 128,072.70 = 53,721.60 : x
  2. Step 2: Convert to fraction form
    85,311.60/128,072.70 = 53,721.60/x
  3. Step 3: Cross multiply
    85,311.60x = 128,072.70 × 53,721.60
  4. Step 4: Simplify right side
    85,311.60x = 6,880,270,360.32
  5. Step 5: Solve for x
    x = 6,880,270,360.32/85,311.60
  6. Step 6: Final answer
    x = 80,648.71

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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.