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Finding the Fourth Proportional to 85,503.85, 128,255.78 and 75,662.35

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Solution

The fourth proportional to 85,503.85, 128,255.78 and 75,662.35 is: 113,493.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,503.85 : 128,255.78 = 75,662.35 : x
  2. Step 2: Convert to fraction form
    85,503.85/128,255.78 = 75,662.35/x
  3. Step 3: Cross multiply
    85,503.85x = 128,255.78 × 75,662.35
  4. Step 4: Simplify right side
    85,503.85x = 9,704,133,337.57
  5. Step 5: Solve for x
    x = 9,704,133,337.57/85,503.85
  6. Step 6: Final answer
    x = 113,493.53

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Similar ratio
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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.