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Finding the Fourth Proportional to 328.76, 491.70 and 268.28

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Solution

The fourth proportional to 328.76, 491.70 and 268.28 is: 401.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.76 : 491.70 = 268.28 : x
  2. Step 2: Convert to fraction form
    328.76/491.70 = 268.28/x
  3. Step 3: Cross multiply
    328.76x = 491.70 × 268.28
  4. Step 4: Simplify right side
    328.76x = 131,913.28
  5. Step 5: Solve for x
    x = 131,913.28/328.76
  6. Step 6: Final answer
    x = 401.24

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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.