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Finding the Fourth Proportional to 393.24, 541.02 and 355.80

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Solution

The fourth proportional to 393.24, 541.02 and 355.80 is: 489.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.24 : 541.02 = 355.80 : x
  2. Step 2: Convert to fraction form
    393.24/541.02 = 355.80/x
  3. Step 3: Cross multiply
    393.24x = 541.02 × 355.80
  4. Step 4: Simplify right side
    393.24x = 192,494.92
  5. Step 5: Solve for x
    x = 192,494.92/393.24
  6. Step 6: Final answer
    x = 489.51

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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.