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Finding the Fourth Proportional to 415, 622.48 and 126.40

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Solution

The fourth proportional to 415, 622.48 and 126.40 is: 189.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    415 : 622.48 = 126.40 : x
  2. Step 2: Convert to fraction form
    415/622.48 = 126.40/x
  3. Step 3: Cross multiply
    415x = 622.48 × 126.40
  4. Step 4: Simplify right side
    415x = 78,681.47
  5. Step 5: Solve for x
    x = 78,681.47/415
  6. Step 6: Final answer
    x = 189.59

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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.