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Finding the Fourth Proportional to 85,408.20, 128,112.30 and 50,387.40

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Solution

The fourth proportional to 85,408.20, 128,112.30 and 50,387.40 is: 75,581.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,408.20 : 128,112.30 = 50,387.40 : x
  2. Step 2: Convert to fraction form
    85,408.20/128,112.30 = 50,387.40/x
  3. Step 3: Cross multiply
    85,408.20x = 128,112.30 × 50,387.40
  4. Step 4: Simplify right side
    85,408.20x = 6,455,245,705.02
  5. Step 5: Solve for x
    x = 6,455,245,705.02/85,408.20
  6. Step 6: Final answer
    x = 75,581.10

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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.