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Finding the Fourth Proportional to 492.86, 739.48 and 218.80

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Solution

The fourth proportional to 492.86, 739.48 and 218.80 is: 328.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.86 : 739.48 = 218.80 : x
  2. Step 2: Convert to fraction form
    492.86/739.48 = 218.80/x
  3. Step 3: Cross multiply
    492.86x = 739.48 × 218.80
  4. Step 4: Simplify right side
    492.86x = 161,798.22
  5. Step 5: Solve for x
    x = 161,798.22/492.86
  6. Step 6: Final answer
    x = 328.28

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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.