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Finding the Fourth Proportional to 415.29, 622.11 and 389.79

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Solution

The fourth proportional to 415.29, 622.11 and 389.79 is: 583.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.29 : 622.11 = 389.79 : x
  2. Step 2: Convert to fraction form
    415.29/622.11 = 389.79/x
  3. Step 3: Cross multiply
    415.29x = 622.11 × 389.79
  4. Step 4: Simplify right side
    415.29x = 242,492.26
  5. Step 5: Solve for x
    x = 242,492.26/415.29
  6. Step 6: Final answer
    x = 583.91

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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.