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Finding the Fourth Proportional to 403.15, 605.07 and 281.50

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Solution

The fourth proportional to 403.15, 605.07 and 281.50 is: 422.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.15 : 605.07 = 281.50 : x
  2. Step 2: Convert to fraction form
    403.15/605.07 = 281.50/x
  3. Step 3: Cross multiply
    403.15x = 605.07 × 281.50
  4. Step 4: Simplify right side
    403.15x = 170,327.21
  5. Step 5: Solve for x
    x = 170,327.21/403.15
  6. Step 6: Final answer
    x = 422.49

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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.