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Finding the Fourth Proportional to 394.70, 544.50 and 278.32

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Solution

The fourth proportional to 394.70, 544.50 and 278.32 is: 383.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.70 : 544.50 = 278.32 : x
  2. Step 2: Convert to fraction form
    394.70/544.50 = 278.32/x
  3. Step 3: Cross multiply
    394.70x = 544.50 × 278.32
  4. Step 4: Simplify right side
    394.70x = 151,545.24
  5. Step 5: Solve for x
    x = 151,545.24/394.70
  6. Step 6: Final answer
    x = 383.95

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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.