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Finding the Fourth Proportional to 85,812.70, 128,719.05 and 50,791.90

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Solution

The fourth proportional to 85,812.70, 128,719.05 and 50,791.90 is: 76,187.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,812.70 : 128,719.05 = 50,791.90 : x
  2. Step 2: Convert to fraction form
    85,812.70/128,719.05 = 50,791.90/x
  3. Step 3: Cross multiply
    85,812.70x = 128,719.05 × 50,791.90
  4. Step 4: Simplify right side
    85,812.70x = 6,537,885,115.70
  5. Step 5: Solve for x
    x = 6,537,885,115.70/85,812.70
  6. Step 6: Final answer
    x = 76,187.85

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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.