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Finding the Fourth Proportional to 415.14, 621.90 and 209.46

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Solution

The fourth proportional to 415.14, 621.90 and 209.46 is: 313.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.14 : 621.90 = 209.46 : x
  2. Step 2: Convert to fraction form
    415.14/621.90 = 209.46/x
  3. Step 3: Cross multiply
    415.14x = 621.90 × 209.46
  4. Step 4: Simplify right side
    415.14x = 130,263.17
  5. Step 5: Solve for x
    x = 130,263.17/415.14
  6. Step 6: Final answer
    x = 313.78

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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.