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Finding the Fourth Proportional to 85,910.93, 128,799.45 and 40,909.08

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Solution

The fourth proportional to 85,910.93, 128,799.45 and 40,909.08 is: 61,331.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,910.93 : 128,799.45 = 40,909.08 : x
  2. Step 2: Convert to fraction form
    85,910.93/128,799.45 = 40,909.08/x
  3. Step 3: Cross multiply
    85,910.93x = 128,799.45 × 40,909.08
  4. Step 4: Simplify right side
    85,910.93x = 5,269,067,487.00
  5. Step 5: Solve for x
    x = 5,269,067,487.00/85,910.93
  6. Step 6: Final answer
    x = 61,331.75

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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.