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Finding the Fourth Proportional to 393,989.60, 590,984.40 and 236,136.80

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Solution

The fourth proportional to 393,989.60, 590,984.40 and 236,136.80 is: 354,205.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,989.60 : 590,984.40 = 236,136.80 : x
  2. Step 2: Convert to fraction form
    393,989.60/590,984.40 = 236,136.80/x
  3. Step 3: Cross multiply
    393,989.60x = 590,984.40 × 236,136.80
  4. Step 4: Simplify right side
    393,989.60x = 139,553,165,065.92
  5. Step 5: Solve for x
    x = 139,553,165,065.92/393,989.60
  6. Step 6: Final answer
    x = 354,205.20

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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.