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Finding the Fourth Proportional to 624.20, 936.38 and 258.79

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Solution

The fourth proportional to 624.20, 936.38 and 258.79 is: 388.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.20 : 936.38 = 258.79 : x
  2. Step 2: Convert to fraction form
    624.20/936.38 = 258.79/x
  3. Step 3: Cross multiply
    624.20x = 936.38 × 258.79
  4. Step 4: Simplify right side
    624.20x = 242,328.12
  5. Step 5: Solve for x
    x = 242,328.12/624.20
  6. Step 6: Final answer
    x = 388.22

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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.