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Finding the Fourth Proportional to 486.20, 728.98 and 197.56

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Solution

The fourth proportional to 486.20, 728.98 and 197.56 is: 296.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.20 : 728.98 = 197.56 : x
  2. Step 2: Convert to fraction form
    486.20/728.98 = 197.56/x
  3. Step 3: Cross multiply
    486.20x = 728.98 × 197.56
  4. Step 4: Simplify right side
    486.20x = 144,017.29
  5. Step 5: Solve for x
    x = 144,017.29/486.20
  6. Step 6: Final answer
    x = 296.21

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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.