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Finding the Fourth Proportional to 85,512.80, 128,269.20 and 61,893.20

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Solution

The fourth proportional to 85,512.80, 128,269.20 and 61,893.20 is: 92,839.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,512.80 : 128,269.20 = 61,893.20 : x
  2. Step 2: Convert to fraction form
    85,512.80/128,269.20 = 61,893.20/x
  3. Step 3: Cross multiply
    85,512.80x = 128,269.20 × 61,893.20
  4. Step 4: Simplify right side
    85,512.80x = 7,938,991,249.44
  5. Step 5: Solve for x
    x = 7,938,991,249.44/85,512.80
  6. Step 6: Final answer
    x = 92,839.80

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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.