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Finding the Fourth Proportional to 484.45, 725.78 and 328.20

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Solution

The fourth proportional to 484.45, 725.78 and 328.20 is: 491.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    484.45 : 725.78 = 328.20 : x
  2. Step 2: Convert to fraction form
    484.45/725.78 = 328.20/x
  3. Step 3: Cross multiply
    484.45x = 725.78 × 328.20
  4. Step 4: Simplify right side
    484.45x = 238,199.36
  5. Step 5: Solve for x
    x = 238,199.36/484.45
  6. Step 6: Final answer
    x = 491.69

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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.