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Finding the Fourth Proportional to 393,105.40, 589,658.10 and 251,387.80

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Solution

The fourth proportional to 393,105.40, 589,658.10 and 251,387.80 is: 377,081.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,105.40 : 589,658.10 = 251,387.80 : x
  2. Step 2: Convert to fraction form
    393,105.40/589,658.10 = 251,387.80/x
  3. Step 3: Cross multiply
    393,105.40x = 589,658.10 × 251,387.80
  4. Step 4: Simplify right side
    393,105.40x = 148,232,852,511.18
  5. Step 5: Solve for x
    x = 148,232,852,511.18/393,105.40
  6. Step 6: Final answer
    x = 377,081.70

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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.