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Finding the Fourth Proportional to 90,198.63, 135,451.04 and 78,366.96

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Solution

The fourth proportional to 90,198.63, 135,451.04 and 78,366.96 is: 117,683.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,198.63 : 135,451.04 = 78,366.96 : x
  2. Step 2: Convert to fraction form
    90,198.63/135,451.04 = 78,366.96/x
  3. Step 3: Cross multiply
    90,198.63x = 135,451.04 × 78,366.96
  4. Step 4: Simplify right side
    90,198.63x = 10,614,885,841.80
  5. Step 5: Solve for x
    x = 10,614,885,841.80/90,198.63
  6. Step 6: Final answer
    x = 117,683.45

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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.