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Finding the Fourth Proportional to 418.24, 627.36 and 129.64

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Solution

The fourth proportional to 418.24, 627.36 and 129.64 is: 194.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.24 : 627.36 = 129.64 : x
  2. Step 2: Convert to fraction form
    418.24/627.36 = 129.64/x
  3. Step 3: Cross multiply
    418.24x = 627.36 × 129.64
  4. Step 4: Simplify right side
    418.24x = 81,330.95
  5. Step 5: Solve for x
    x = 81,330.95/418.24
  6. Step 6: Final answer
    x = 194.46

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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.