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Finding the Fourth Proportional to 492.72, 739.08 and 218.74

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Solution

The fourth proportional to 492.72, 739.08 and 218.74 is: 328.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.72 : 739.08 = 218.74 : x
  2. Step 2: Convert to fraction form
    492.72/739.08 = 218.74/x
  3. Step 3: Cross multiply
    492.72x = 739.08 × 218.74
  4. Step 4: Simplify right side
    492.72x = 161,662.66
  5. Step 5: Solve for x
    x = 161,662.66/492.72
  6. Step 6: Final answer
    x = 328.10

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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.