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Finding the Fourth Proportional to 448.03, 618.56 and 355.15

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Solution

The fourth proportional to 448.03, 618.56 and 355.15 is: 490.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.03 : 618.56 = 355.15 : x
  2. Step 2: Convert to fraction form
    448.03/618.56 = 355.15/x
  3. Step 3: Cross multiply
    448.03x = 618.56 × 355.15
  4. Step 4: Simplify right side
    448.03x = 219,681.58
  5. Step 5: Solve for x
    x = 219,681.58/448.03
  6. Step 6: Final answer
    x = 490.33

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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.