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Finding the Fourth Proportional to 494.10, 681.87 and 328.20

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Solution

The fourth proportional to 494.10, 681.87 and 328.20 is: 452.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    494.10 : 681.87 = 328.20 : x
  2. Step 2: Convert to fraction form
    494.10/681.87 = 328.20/x
  3. Step 3: Cross multiply
    494.10x = 681.87 × 328.20
  4. Step 4: Simplify right side
    494.10x = 223,790.40
  5. Step 5: Solve for x
    x = 223,790.40/494.10
  6. Step 6: Final answer
    x = 452.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.