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Finding the Fourth Proportional to 90,425, 135,644.88 and 45,423.21

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Solution

The fourth proportional to 90,425, 135,644.88 and 45,423.21 is: 68,138.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,425 : 135,644.88 = 45,423.21 : x
  2. Step 2: Convert to fraction form
    90,425/135,644.88 = 45,423.21/x
  3. Step 3: Cross multiply
    90,425x = 135,644.88 × 45,423.21
  4. Step 4: Simplify right side
    90,425x = 6,161,425,869.66
  5. Step 5: Solve for x
    x = 6,161,425,869.66/90,425
  6. Step 6: Final answer
    x = 68,138.52

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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.