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Finding the Fourth Proportional to 85,745.78, 128,613.69 and 25,772.96

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Solution

The fourth proportional to 85,745.78, 128,613.69 and 25,772.96 is: 38,657.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,745.78 : 128,613.69 = 25,772.96 : x
  2. Step 2: Convert to fraction form
    85,745.78/128,613.69 = 25,772.96/x
  3. Step 3: Cross multiply
    85,745.78x = 128,613.69 × 25,772.96
  4. Step 4: Simplify right side
    85,745.78x = 3,314,755,487.82
  5. Step 5: Solve for x
    x = 3,314,755,487.82/85,745.78
  6. Step 6: Final answer
    x = 38,657.94

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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.