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Finding the Fourth Proportional to 90,579.70, 135,718.38 and 39,903.22

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Solution

The fourth proportional to 90,579.70, 135,718.38 and 39,903.22 is: 59,788.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,579.70 : 135,718.38 = 39,903.22 : x
  2. Step 2: Convert to fraction form
    90,579.70/135,718.38 = 39,903.22/x
  3. Step 3: Cross multiply
    90,579.70x = 135,718.38 × 39,903.22
  4. Step 4: Simplify right side
    90,579.70x = 5,415,600,375.18
  5. Step 5: Solve for x
    x = 5,415,600,375.18/90,579.70
  6. Step 6: Final answer
    x = 59,788.23

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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.