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Finding the Fourth Proportional to 328.32, 491.22 and 279.45

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Solution

The fourth proportional to 328.32, 491.22 and 279.45 is: 418.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.32 : 491.22 = 279.45 : x
  2. Step 2: Convert to fraction form
    328.32/491.22 = 279.45/x
  3. Step 3: Cross multiply
    328.32x = 491.22 × 279.45
  4. Step 4: Simplify right side
    328.32x = 137,271.43
  5. Step 5: Solve for x
    x = 137,271.43/328.32
  6. Step 6: Final answer
    x = 418.10

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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.