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Finding the Fourth Proportional to 85,414.70, 128,122.05 and 54,310.70

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Solution

The fourth proportional to 85,414.70, 128,122.05 and 54,310.70 is: 81,466.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,414.70 : 128,122.05 = 54,310.70 : x
  2. Step 2: Convert to fraction form
    85,414.70/128,122.05 = 54,310.70/x
  3. Step 3: Cross multiply
    85,414.70x = 128,122.05 × 54,310.70
  4. Step 4: Simplify right side
    85,414.70x = 6,958,398,220.94
  5. Step 5: Solve for x
    x = 6,958,398,220.94/85,414.70
  6. Step 6: Final answer
    x = 81,466.05

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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.