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Finding the Fourth Proportional to 416.30, 624.28 and 172.80

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Solution

The fourth proportional to 416.30, 624.28 and 172.80 is: 259.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    416.30 : 624.28 = 172.80 : x
  2. Step 2: Convert to fraction form
    416.30/624.28 = 172.80/x
  3. Step 3: Cross multiply
    416.30x = 624.28 × 172.80
  4. Step 4: Simplify right side
    416.30x = 107,875.58
  5. Step 5: Solve for x
    x = 107,875.58/416.30
  6. Step 6: Final answer
    x = 259.13

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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.