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Finding the Fourth Proportional to 393.48, 541.77 and 356.58

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Solution

The fourth proportional to 393.48, 541.77 and 356.58 is: 490.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.48 : 541.77 = 356.58 : x
  2. Step 2: Convert to fraction form
    393.48/541.77 = 356.58/x
  3. Step 3: Cross multiply
    393.48x = 541.77 × 356.58
  4. Step 4: Simplify right side
    393.48x = 193,184.35
  5. Step 5: Solve for x
    x = 193,184.35/393.48
  6. Step 6: Final answer
    x = 490.96

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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.