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Finding the Fourth Proportional to 403.33, 605.08 and 278.79

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Solution

The fourth proportional to 403.33, 605.08 and 278.79 is: 418.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.33 : 605.08 = 278.79 : x
  2. Step 2: Convert to fraction form
    403.33/605.08 = 278.79/x
  3. Step 3: Cross multiply
    403.33x = 605.08 × 278.79
  4. Step 4: Simplify right side
    403.33x = 168,688.86
  5. Step 5: Solve for x
    x = 168,688.86/403.33
  6. Step 6: Final answer
    x = 418.24

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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.