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Finding the Fourth Proportional to 356.44, 490.98 and 278.68

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Solution

The fourth proportional to 356.44, 490.98 and 278.68 is: 383.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.44 : 490.98 = 278.68 : x
  2. Step 2: Convert to fraction form
    356.44/490.98 = 278.68/x
  3. Step 3: Cross multiply
    356.44x = 490.98 × 278.68
  4. Step 4: Simplify right side
    356.44x = 136,826.31
  5. Step 5: Solve for x
    x = 136,826.31/356.44
  6. Step 6: Final answer
    x = 383.87

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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.