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Finding the Fourth Proportional to 328.78, 493.17 and 155.45

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Solution

The fourth proportional to 328.78, 493.17 and 155.45 is: 233.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.78 : 493.17 = 155.45 : x
  2. Step 2: Convert to fraction form
    328.78/493.17 = 155.45/x
  3. Step 3: Cross multiply
    328.78x = 493.17 × 155.45
  4. Step 4: Simplify right side
    328.78x = 76,660.03
  5. Step 5: Solve for x
    x = 76,660.03/328.78
  6. Step 6: Final answer
    x = 233.17

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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.