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Finding the Fourth Proportional to 447.81, 618.27 and 307.88

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Solution

The fourth proportional to 447.81, 618.27 and 307.88 is: 425.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.81 : 618.27 = 307.88 : x
  2. Step 2: Convert to fraction form
    447.81/618.27 = 307.88/x
  3. Step 3: Cross multiply
    447.81x = 618.27 × 307.88
  4. Step 4: Simplify right side
    447.81x = 190,351.43
  5. Step 5: Solve for x
    x = 190,351.43/447.81
  6. Step 6: Final answer
    x = 425.07

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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.