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Finding the Fourth Proportional to 400.60, 600.90 and 278.74

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Solution

The fourth proportional to 400.60, 600.90 and 278.74 is: 418.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.60 : 600.90 = 278.74 : x
  2. Step 2: Convert to fraction form
    400.60/600.90 = 278.74/x
  3. Step 3: Cross multiply
    400.60x = 600.90 × 278.74
  4. Step 4: Simplify right side
    400.60x = 167,494.87
  5. Step 5: Solve for x
    x = 167,494.87/400.60
  6. Step 6: Final answer
    x = 418.11

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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.