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Finding the Fourth Proportional to 448.31, 618.95 and 308.38

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Solution

The fourth proportional to 448.31, 618.95 and 308.38 is: 425.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.31 : 618.95 = 308.38 : x
  2. Step 2: Convert to fraction form
    448.31/618.95 = 308.38/x
  3. Step 3: Cross multiply
    448.31x = 618.95 × 308.38
  4. Step 4: Simplify right side
    448.31x = 190,871.80
  5. Step 5: Solve for x
    x = 190,871.80/448.31
  6. Step 6: Final answer
    x = 425.76

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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.