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Finding the Fourth Proportional to 90,639,375.60, 135,959,063.40 and 78,309,944.40

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Solution

The fourth proportional to 90,639,375.60, 135,959,063.40 and 78,309,944.40 is: 117,464,916.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,639,375.60 : 135,959,063.40 = 78,309,944.40 : x
  2. Step 2: Convert to fraction form
    90,639,375.60/135,959,063.40 = 78,309,944.40/x
  3. Step 3: Cross multiply
    90,639,375.60x = 135,959,063.40 × 78,309,944.40
  4. Step 4: Simplify right side
    90,639,375.60x = 10,646,946,695,530,076
  5. Step 5: Solve for x
    x = 10,646,946,695,530,076/90,639,375.60
  6. Step 6: Final answer
    x = 117,464,916.60

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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.