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Finding the Fourth Proportional to 66,906.60, 100,359.90 and 45,911.40

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Solution

The fourth proportional to 66,906.60, 100,359.90 and 45,911.40 is: 68,867.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,906.60 : 100,359.90 = 45,911.40 : x
  2. Step 2: Convert to fraction form
    66,906.60/100,359.90 = 45,911.40/x
  3. Step 3: Cross multiply
    66,906.60x = 100,359.90 × 45,911.40
  4. Step 4: Simplify right side
    66,906.60x = 4,607,663,512.86
  5. Step 5: Solve for x
    x = 4,607,663,512.86/66,906.60
  6. Step 6: Final answer
    x = 68,867.10

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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.