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Finding the Fourth Proportional to 485.52, 728.34 and 196.89

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Solution

The fourth proportional to 485.52, 728.34 and 196.89 is: 295.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.52 : 728.34 = 196.89 : x
  2. Step 2: Convert to fraction form
    485.52/728.34 = 196.89/x
  3. Step 3: Cross multiply
    485.52x = 728.34 × 196.89
  4. Step 4: Simplify right side
    485.52x = 143,402.86
  5. Step 5: Solve for x
    x = 143,402.86/485.52
  6. Step 6: Final answer
    x = 295.36

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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.