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Finding the Fourth Proportional to 328.50, 492.78 and 155.12

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Solution

The fourth proportional to 328.50, 492.78 and 155.12 is: 232.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.50 : 492.78 = 155.12 : x
  2. Step 2: Convert to fraction form
    328.50/492.78 = 155.12/x
  3. Step 3: Cross multiply
    328.50x = 492.78 × 155.12
  4. Step 4: Simplify right side
    328.50x = 76,440.03
  5. Step 5: Solve for x
    x = 76,440.03/328.50
  6. Step 6: Final answer
    x = 232.69

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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.