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Finding the Fourth Proportional to 448.43, 618.37 and 355.03

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Solution

The fourth proportional to 448.43, 618.37 and 355.03 is: 489.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.43 : 618.37 = 355.03 : x
  2. Step 2: Convert to fraction form
    448.43/618.37 = 355.03/x
  3. Step 3: Cross multiply
    448.43x = 618.37 × 355.03
  4. Step 4: Simplify right side
    448.43x = 219,539.90
  5. Step 5: Solve for x
    x = 219,539.90/448.43
  6. Step 6: Final answer
    x = 489.57

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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.