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Finding the Fourth Proportional to 320.61, 480.92 and 77.14

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Solution

The fourth proportional to 320.61, 480.92 and 77.14 is: 115.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.61 : 480.92 = 77.14 : x
  2. Step 2: Convert to fraction form
    320.61/480.92 = 77.14/x
  3. Step 3: Cross multiply
    320.61x = 480.92 × 77.14
  4. Step 4: Simplify right side
    320.61x = 37,096.77
  5. Step 5: Solve for x
    x = 37,096.77/320.61
  6. Step 6: Final answer
    x = 115.71

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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.