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Finding the Fourth Proportional to 85,651.67, 128,476.77 and 66,947.42

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Solution

The fourth proportional to 85,651.67, 128,476.77 and 66,947.42 is: 100,420.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,651.67 : 128,476.77 = 66,947.42 : x
  2. Step 2: Convert to fraction form
    85,651.67/128,476.77 = 66,947.42/x
  3. Step 3: Cross multiply
    85,651.67x = 128,476.77 × 66,947.42
  4. Step 4: Simplify right side
    85,651.67x = 8,601,188,351.57
  5. Step 5: Solve for x
    x = 8,601,188,351.57/85,651.67
  6. Step 6: Final answer
    x = 100,420.55

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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.