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Finding the Fourth Proportional to 328.75, 493.21 and 100.75

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Solution

The fourth proportional to 328.75, 493.21 and 100.75 is: 151.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.75 : 493.21 = 100.75 : x
  2. Step 2: Convert to fraction form
    328.75/493.21 = 100.75/x
  3. Step 3: Cross multiply
    328.75x = 493.21 × 100.75
  4. Step 4: Simplify right side
    328.75x = 49,690.40
  5. Step 5: Solve for x
    x = 49,690.40/328.75
  6. Step 6: Final answer
    x = 151.15

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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.