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Finding the Fourth Proportional to 320,439.20, 480,658.80 and 320,439.20

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Solution

The fourth proportional to 320,439.20, 480,658.80 and 320,439.20 is: 480,658.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    320,439.20 : 480,658.80 = 320,439.20 : x
  2. Step 2: Convert to fraction form
    320,439.20/480,658.80 = 320,439.20/x
  3. Step 3: Cross multiply
    320,439.20x = 480,658.80 × 320,439.20
  4. Step 4: Simplify right side
    320,439.20x = 154,021,921,344.96
  5. Step 5: Solve for x
    x = 154,021,921,344.96/320,439.20
  6. Step 6: Final answer
    x = 480,658.80

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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.