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Finding the Fourth Proportional to 403.50, 557.10 and 305.78

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Solution

The fourth proportional to 403.50, 557.10 and 305.78 is: 422.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.50 : 557.10 = 305.78 : x
  2. Step 2: Convert to fraction form
    403.50/557.10 = 305.78/x
  3. Step 3: Cross multiply
    403.50x = 557.10 × 305.78
  4. Step 4: Simplify right side
    403.50x = 170,350.04
  5. Step 5: Solve for x
    x = 170,350.04/403.50
  6. Step 6: Final answer
    x = 422.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.