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Finding the Fourth Proportional to 320.72, 480.78 and 156.09

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Solution

The fourth proportional to 320.72, 480.78 and 156.09 is: 233.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.72 : 480.78 = 156.09 : x
  2. Step 2: Convert to fraction form
    320.72/480.78 = 156.09/x
  3. Step 3: Cross multiply
    320.72x = 480.78 × 156.09
  4. Step 4: Simplify right side
    320.72x = 75,044.95
  5. Step 5: Solve for x
    x = 75,044.95/320.72
  6. Step 6: Final answer
    x = 233.99

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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.