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Finding the Fourth Proportional to 328.68, 491.76 and 191.79

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Solution

The fourth proportional to 328.68, 491.76 and 191.79 is: 286.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.68 : 491.76 = 191.79 : x
  2. Step 2: Convert to fraction form
    328.68/491.76 = 191.79/x
  3. Step 3: Cross multiply
    328.68x = 491.76 × 191.79
  4. Step 4: Simplify right side
    328.68x = 94,314.65
  5. Step 5: Solve for x
    x = 94,314.65/328.68
  6. Step 6: Final answer
    x = 286.95

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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.