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Finding the Fourth Proportional to 90,601.70, 135,902.55 and 56,921.90

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Solution

The fourth proportional to 90,601.70, 135,902.55 and 56,921.90 is: 85,382.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,601.70 : 135,902.55 = 56,921.90 : x
  2. Step 2: Convert to fraction form
    90,601.70/135,902.55 = 56,921.90/x
  3. Step 3: Cross multiply
    90,601.70x = 135,902.55 × 56,921.90
  4. Step 4: Simplify right side
    90,601.70x = 7,735,831,360.85
  5. Step 5: Solve for x
    x = 7,735,831,360.85/90,601.70
  6. Step 6: Final answer
    x = 85,382.85

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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.