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Finding the Fourth Proportional to 320,487.92, 480,392.89 and 120,721.88

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Solution

The fourth proportional to 320,487.92, 480,392.89 and 120,721.88 is: 180,955.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    320,487.92 : 480,392.89 = 120,721.88 : x
  2. Step 2: Convert to fraction form
    320,487.92/480,392.89 = 120,721.88/x
  3. Step 3: Cross multiply
    320,487.92x = 480,392.89 × 120,721.88
  4. Step 4: Simplify right side
    320,487.92x = 57,993,932,819.43
  5. Step 5: Solve for x
    x = 57,993,932,819.43/320,487.92
  6. Step 6: Final answer
    x = 180,955.13

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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.