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Finding the Fourth Proportional to 90,381.96, 135,396.52 and 42,929.56

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Solution

The fourth proportional to 90,381.96, 135,396.52 and 42,929.56 is: 64,310.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,381.96 : 135,396.52 = 42,929.56 : x
  2. Step 2: Convert to fraction form
    90,381.96/135,396.52 = 42,929.56/x
  3. Step 3: Cross multiply
    90,381.96x = 135,396.52 × 42,929.56
  4. Step 4: Simplify right side
    90,381.96x = 5,812,513,029.13
  5. Step 5: Solve for x
    x = 5,812,513,029.13/90,381.96
  6. Step 6: Final answer
    x = 64,310.54

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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.