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Finding the Fourth Proportional to 85,379.67, 128,067.72 and 28,457.70

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Solution

The fourth proportional to 85,379.67, 128,067.72 and 28,457.70 is: 42,685.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,379.67 : 128,067.72 = 28,457.70 : x
  2. Step 2: Convert to fraction form
    85,379.67/128,067.72 = 28,457.70/x
  3. Step 3: Cross multiply
    85,379.67x = 128,067.72 × 28,457.70
  4. Step 4: Simplify right side
    85,379.67x = 3,644,512,755.44
  5. Step 5: Solve for x
    x = 3,644,512,755.44/85,379.67
  6. Step 6: Final answer
    x = 42,685.96

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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.