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Finding the Fourth Proportional to 403.15, 605.40 and 266.80

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Solution

The fourth proportional to 403.15, 605.40 and 266.80 is: 400.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.15 : 605.40 = 266.80 : x
  2. Step 2: Convert to fraction form
    403.15/605.40 = 266.80/x
  3. Step 3: Cross multiply
    403.15x = 605.40 × 266.80
  4. Step 4: Simplify right side
    403.15x = 161,520.72
  5. Step 5: Solve for x
    x = 161,520.72/403.15
  6. Step 6: Final answer
    x = 400.65

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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.