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Finding the Fourth Proportional to 312,136.20, 468,279.90 and 90,520.20

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Solution

The fourth proportional to 312,136.20, 468,279.90 and 90,520.20 is: 135,802.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,136.20 : 468,279.90 = 90,520.20 : x
  2. Step 2: Convert to fraction form
    312,136.20/468,279.90 = 90,520.20/x
  3. Step 3: Cross multiply
    312,136.20x = 468,279.90 × 90,520.20
  4. Step 4: Simplify right side
    312,136.20x = 42,388,790,203.98
  5. Step 5: Solve for x
    x = 42,388,790,203.98/312,136.20
  6. Step 6: Final answer
    x = 135,802.22

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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.