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Finding the Fourth Proportional to 85,998.60, 128,997.90 and 50,423.40

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Solution

The fourth proportional to 85,998.60, 128,997.90 and 50,423.40 is: 75,635.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,998.60 : 128,997.90 = 50,423.40 : x
  2. Step 2: Convert to fraction form
    85,998.60/128,997.90 = 50,423.40/x
  3. Step 3: Cross multiply
    85,998.60x = 128,997.90 × 50,423.40
  4. Step 4: Simplify right side
    85,998.60x = 6,504,512,710.86
  5. Step 5: Solve for x
    x = 6,504,512,710.86/85,998.60
  6. Step 6: Final answer
    x = 75,635.10

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Double scale
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Similar ratio
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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.