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Finding the Fourth Proportional to 328.67, 493.00 and 81.87

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Solution

The fourth proportional to 328.67, 493.00 and 81.87 is: 122.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.67 : 493.00 = 81.87 : x
  2. Step 2: Convert to fraction form
    328.67/493.00 = 81.87/x
  3. Step 3: Cross multiply
    328.67x = 493.00 × 81.87
  4. Step 4: Simplify right side
    328.67x = 40,360.43
  5. Step 5: Solve for x
    x = 40,360.43/328.67
  6. Step 6: Final answer
    x = 122.80

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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.