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Finding the Fourth Proportional to 394.88, 544.92 and 278.60

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Solution

The fourth proportional to 394.88, 544.92 and 278.60 is: 384.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.88 : 544.92 = 278.60 : x
  2. Step 2: Convert to fraction form
    394.88/544.92 = 278.60/x
  3. Step 3: Cross multiply
    394.88x = 544.92 × 278.60
  4. Step 4: Simplify right side
    394.88x = 151,814.71
  5. Step 5: Solve for x
    x = 151,814.71/394.88
  6. Step 6: Final answer
    x = 384.46

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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.