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Finding the Fourth Proportional to 394.45, 591.03 and 278.69

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Solution

The fourth proportional to 394.45, 591.03 and 278.69 is: 417.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.45 : 591.03 = 278.69 : x
  2. Step 2: Convert to fraction form
    394.45/591.03 = 278.69/x
  3. Step 3: Cross multiply
    394.45x = 591.03 × 278.69
  4. Step 4: Simplify right side
    394.45x = 164,711.20
  5. Step 5: Solve for x
    x = 164,711.20/394.45
  6. Step 6: Final answer
    x = 417.57

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.