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Finding the Fourth Proportional to 415.02, 622.56 and 209.40

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Solution

The fourth proportional to 415.02, 622.56 and 209.40 is: 314.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.02 : 622.56 = 209.40 : x
  2. Step 2: Convert to fraction form
    415.02/622.56 = 209.40/x
  3. Step 3: Cross multiply
    415.02x = 622.56 × 209.40
  4. Step 4: Simplify right side
    415.02x = 130,364.06
  5. Step 5: Solve for x
    x = 130,364.06/415.02
  6. Step 6: Final answer
    x = 314.12

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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.