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Finding the Fourth Proportional to 90,649.69, 135,765.84 and 77,855.74

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Solution

The fourth proportional to 90,649.69, 135,765.84 and 77,855.74 is: 116,604.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,649.69 : 135,765.84 = 77,855.74 : x
  2. Step 2: Convert to fraction form
    90,649.69/135,765.84 = 77,855.74/x
  3. Step 3: Cross multiply
    90,649.69x = 135,765.84 × 77,855.74
  4. Step 4: Simplify right side
    90,649.69x = 10,570,149,939.92
  5. Step 5: Solve for x
    x = 10,570,149,939.92/90,649.69
  6. Step 6: Final answer
    x = 116,604.37

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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.