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Finding the Fourth Proportional to 328.12, 491.57 and 191.13

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Solution

The fourth proportional to 328.12, 491.57 and 191.13 is: 286.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.12 : 491.57 = 191.13 : x
  2. Step 2: Convert to fraction form
    328.12/491.57 = 191.13/x
  3. Step 3: Cross multiply
    328.12x = 491.57 × 191.13
  4. Step 4: Simplify right side
    328.12x = 93,951.69
  5. Step 5: Solve for x
    x = 93,951.69/328.12
  6. Step 6: Final answer
    x = 286.34

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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.