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Finding the Fourth Proportional to 416.28, 624.40 and 172.64

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Solution

The fourth proportional to 416.28, 624.40 and 172.64 is: 258.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    416.28 : 624.40 = 172.64 : x
  2. Step 2: Convert to fraction form
    416.28/624.40 = 172.64/x
  3. Step 3: Cross multiply
    416.28x = 624.40 × 172.64
  4. Step 4: Simplify right side
    416.28x = 107,796.42
  5. Step 5: Solve for x
    x = 107,796.42/416.28
  6. Step 6: Final answer
    x = 258.95

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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.