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Finding the Fourth Proportional to 328.56, 492.80 and 191.88

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Solution

The fourth proportional to 328.56, 492.80 and 191.88 is: 287.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.56 : 492.80 = 191.88 : x
  2. Step 2: Convert to fraction form
    328.56/492.80 = 191.88/x
  3. Step 3: Cross multiply
    328.56x = 492.80 × 191.88
  4. Step 4: Simplify right side
    328.56x = 94,558.46
  5. Step 5: Solve for x
    x = 94,558.46/328.56
  6. Step 6: Final answer
    x = 287.80

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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.