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Finding the Fourth Proportional to 328.74, 492.57 and 191.90

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Solution

The fourth proportional to 328.74, 492.57 and 191.90 is: 287.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.74 : 492.57 = 191.90 : x
  2. Step 2: Convert to fraction form
    328.74/492.57 = 191.90/x
  3. Step 3: Cross multiply
    328.74x = 492.57 × 191.90
  4. Step 4: Simplify right side
    328.74x = 94,521.72
  5. Step 5: Solve for x
    x = 94,521.72/328.74
  6. Step 6: Final answer
    x = 287.53

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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.