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Finding the Fourth Proportional to 66,815.79, 100,127.78 and 40,172.67

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Solution

The fourth proportional to 66,815.79, 100,127.78 and 40,172.67 is: 60,201.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,815.79 : 100,127.78 = 40,172.67 : x
  2. Step 2: Convert to fraction form
    66,815.79/100,127.78 = 40,172.67/x
  3. Step 3: Cross multiply
    66,815.79x = 100,127.78 × 40,172.67
  4. Step 4: Simplify right side
    66,815.79x = 4,022,399,931.95
  5. Step 5: Solve for x
    x = 4,022,399,931.95/66,815.79
  6. Step 6: Final answer
    x = 60,201.33

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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.