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Finding the Fourth Proportional to 415.08, 621.95 and 220.07

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Solution

The fourth proportional to 415.08, 621.95 and 220.07 is: 329.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.08 : 621.95 = 220.07 : x
  2. Step 2: Convert to fraction form
    415.08/621.95 = 220.07/x
  3. Step 3: Cross multiply
    415.08x = 621.95 × 220.07
  4. Step 4: Simplify right side
    415.08x = 136,868.33
  5. Step 5: Solve for x
    x = 136,868.33/415.08
  6. Step 6: Final answer
    x = 329.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.