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Finding the Fourth Proportional to 99,806,519.60, 149,485,830.60 and 81,890,615.60

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Solution

The fourth proportional to 99,806,519.60, 149,485,830.60 and 81,890,615.60 is: 122,652,174.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,806,519.60 : 149,485,830.60 = 81,890,615.60 : x
  2. Step 2: Convert to fraction form
    99,806,519.60/149,485,830.60 = 81,890,615.60/x
  3. Step 3: Cross multiply
    99,806,519.60x = 149,485,830.60 × 81,890,615.60
  4. Step 4: Simplify right side
    99,806,519.60x = 12,241,486,691,311,316
  5. Step 5: Solve for x
    x = 12,241,486,691,311,316/99,806,519.60
  6. Step 6: Final answer
    x = 122,652,174.83

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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.