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Finding the Fourth Proportional to 138,913.60, 208,467.60 and 89,114.80

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Solution

The fourth proportional to 138,913.60, 208,467.60 and 89,114.80 is: 133,734.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,913.60 : 208,467.60 = 89,114.80 : x
  2. Step 2: Convert to fraction form
    138,913.60/208,467.60 = 89,114.80/x
  3. Step 3: Cross multiply
    138,913.60x = 208,467.60 × 89,114.80
  4. Step 4: Simplify right side
    138,913.60x = 18,577,548,480.48
  5. Step 5: Solve for x
    x = 18,577,548,480.48/138,913.60
  6. Step 6: Final answer
    x = 133,734.56

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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.