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Finding the Fourth Proportional to 90,578.70, 135,716.88 and 39,902.22

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Solution

The fourth proportional to 90,578.70, 135,716.88 and 39,902.22 is: 59,786.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,578.70 : 135,716.88 = 39,902.22 : x
  2. Step 2: Convert to fraction form
    90,578.70/135,716.88 = 39,902.22/x
  3. Step 3: Cross multiply
    90,578.70x = 135,716.88 × 39,902.22
  4. Step 4: Simplify right side
    90,578.70x = 5,415,404,803.47
  5. Step 5: Solve for x
    x = 5,415,404,803.47/90,578.70
  6. Step 6: Final answer
    x = 59,786.74

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1.5x scale

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.