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Finding the Fourth Proportional to 55,640.70, 83,402.72 and 20,557.98

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Solution

The fourth proportional to 55,640.70, 83,402.72 and 20,557.98 is: 30,815.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,640.70 : 83,402.72 = 20,557.98 : x
  2. Step 2: Convert to fraction form
    55,640.70/83,402.72 = 20,557.98/x
  3. Step 3: Cross multiply
    55,640.70x = 83,402.72 × 20,557.98
  4. Step 4: Simplify right side
    55,640.70x = 1,714,591,084.09
  5. Step 5: Solve for x
    x = 1,714,591,084.09/55,640.70
  6. Step 6: Final answer
    x = 30,815.41

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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.