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Finding the Fourth Proportional to 137,311.70, 205,621.95 and 90,310.10

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Solution

The fourth proportional to 137,311.70, 205,621.95 and 90,310.10 is: 135,237.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,311.70 : 205,621.95 = 90,310.10 : x
  2. Step 2: Convert to fraction form
    137,311.70/205,621.95 = 90,310.10/x
  3. Step 3: Cross multiply
    137,311.70x = 205,621.95 × 90,310.10
  4. Step 4: Simplify right side
    137,311.70x = 18,569,738,866.70
  5. Step 5: Solve for x
    x = 18,569,738,866.70/137,311.70
  6. Step 6: Final answer
    x = 135,237.85

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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.