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Finding the Fourth Proportional to 415.64, 623.44 and 127.28

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Solution

The fourth proportional to 415.64, 623.44 and 127.28 is: 190.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.64 : 623.44 = 127.28 : x
  2. Step 2: Convert to fraction form
    415.64/623.44 = 127.28/x
  3. Step 3: Cross multiply
    415.64x = 623.44 × 127.28
  4. Step 4: Simplify right side
    415.64x = 79,351.44
  5. Step 5: Solve for x
    x = 79,351.44/415.64
  6. Step 6: Final answer
    x = 190.91

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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.