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Finding the Fourth Proportional to 209,110.70, 313,489.72 and 90,692.85

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Solution

The fourth proportional to 209,110.70, 313,489.72 and 90,692.85 is: 135,962.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,110.70 : 313,489.72 = 90,692.85 : x
  2. Step 2: Convert to fraction form
    209,110.70/313,489.72 = 90,692.85/x
  3. Step 3: Cross multiply
    209,110.70x = 313,489.72 × 90,692.85
  4. Step 4: Simplify right side
    209,110.70x = 28,431,275,423.00
  5. Step 5: Solve for x
    x = 28,431,275,423.00/209,110.70
  6. Step 6: Final answer
    x = 135,962.80

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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.