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Finding the Fourth Proportional to 443.13, 611.31 and 303.40

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Solution

The fourth proportional to 443.13, 611.31 and 303.40 is: 418.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.13 : 611.31 = 303.40 : x
  2. Step 2: Convert to fraction form
    443.13/611.31 = 303.40/x
  3. Step 3: Cross multiply
    443.13x = 611.31 × 303.40
  4. Step 4: Simplify right side
    443.13x = 185,471.45
  5. Step 5: Solve for x
    x = 185,471.45/443.13
  6. Step 6: Final answer
    x = 418.55

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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.