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Finding the Fourth Proportional to 394.80, 544.48 and 356.40

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Solution

The fourth proportional to 394.80, 544.48 and 356.40 is: 491.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.80 : 544.48 = 356.40 : x
  2. Step 2: Convert to fraction form
    394.80/544.48 = 356.40/x
  3. Step 3: Cross multiply
    394.80x = 544.48 × 356.40
  4. Step 4: Simplify right side
    394.80x = 194,052.67
  5. Step 5: Solve for x
    x = 194,052.67/394.80
  6. Step 6: Final answer
    x = 491.52

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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.