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Finding the Fourth Proportional to 85,821.70, 128,732.55 and 50,800.90

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Solution

The fourth proportional to 85,821.70, 128,732.55 and 50,800.90 is: 76,201.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,821.70 : 128,732.55 = 50,800.90 : x
  2. Step 2: Convert to fraction form
    85,821.70/128,732.55 = 50,800.90/x
  3. Step 3: Cross multiply
    85,821.70x = 128,732.55 × 50,800.90
  4. Step 4: Simplify right side
    85,821.70x = 6,539,729,399.30
  5. Step 5: Solve for x
    x = 6,539,729,399.30/85,821.70
  6. Step 6: Final answer
    x = 76,201.35

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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.