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Finding the Fourth Proportional to 243,388.20, 365,136.70 and 85,621.80

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Solution

The fourth proportional to 243,388.20, 365,136.70 and 85,621.80 is: 128,451.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    243,388.20 : 365,136.70 = 85,621.80 : x
  2. Step 2: Convert to fraction form
    243,388.20/365,136.70 = 85,621.80/x
  3. Step 3: Cross multiply
    243,388.20x = 365,136.70 × 85,621.80
  4. Step 4: Simplify right side
    243,388.20x = 31,263,661,500.06
  5. Step 5: Solve for x
    x = 31,263,661,500.06/243,388.20
  6. Step 6: Final answer
    x = 128,451.84

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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.