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Finding the Fourth Proportional to 66,999.40, 100,280.40 and 52,127.80

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Solution

The fourth proportional to 66,999.40, 100,280.40 and 52,127.80 is: 78,021.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,999.40 : 100,280.40 = 52,127.80 : x
  2. Step 2: Convert to fraction form
    66,999.40/100,280.40 = 52,127.80/x
  3. Step 3: Cross multiply
    66,999.40x = 100,280.40 × 52,127.80
  4. Step 4: Simplify right side
    66,999.40x = 5,227,396,635.12
  5. Step 5: Solve for x
    x = 5,227,396,635.12/66,999.40
  6. Step 6: Final answer
    x = 78,021.54

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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.