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Finding the Fourth Proportional to 90,612,138.45, 135,918,207.68 and 90,612,138.45

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Solution

The fourth proportional to 90,612,138.45, 135,918,207.68 and 90,612,138.45 is: 135,918,207.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,612,138.45 : 135,918,207.68 = 90,612,138.45 : x
  2. Step 2: Convert to fraction form
    90,612,138.45/135,918,207.68 = 90,612,138.45/x
  3. Step 3: Cross multiply
    90,612,138.45x = 135,918,207.68 × 90,612,138.45
  4. Step 4: Simplify right side
    90,612,138.45x = 12,315,839,451,722,954
  5. Step 5: Solve for x
    x = 12,315,839,451,722,954/90,612,138.45
  6. Step 6: Final answer
    x = 135,918,207.68

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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.