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Finding the Fourth Proportional to 403.47, 605.40 and 197.79

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Solution

The fourth proportional to 403.47, 605.40 and 197.79 is: 296.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.47 : 605.40 = 197.79 : x
  2. Step 2: Convert to fraction form
    403.47/605.40 = 197.79/x
  3. Step 3: Cross multiply
    403.47x = 605.40 × 197.79
  4. Step 4: Simplify right side
    403.47x = 119,742.07
  5. Step 5: Solve for x
    x = 119,742.07/403.47
  6. Step 6: Final answer
    x = 296.78

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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.