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Finding the Fourth Proportional to 448.62, 618.49 and 315.66

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Solution

The fourth proportional to 448.62, 618.49 and 315.66 is: 435.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.62 : 618.49 = 315.66 : x
  2. Step 2: Convert to fraction form
    448.62/618.49 = 315.66/x
  3. Step 3: Cross multiply
    448.62x = 618.49 × 315.66
  4. Step 4: Simplify right side
    448.62x = 195,235.27
  5. Step 5: Solve for x
    x = 195,235.27/448.62
  6. Step 6: Final answer
    x = 435.19

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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.