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Finding the Fourth Proportional to 291.18, 436.53 and 198.66

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Solution

The fourth proportional to 291.18, 436.53 and 198.66 is: 297.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.18 : 436.53 = 198.66 : x
  2. Step 2: Convert to fraction form
    291.18/436.53 = 198.66/x
  3. Step 3: Cross multiply
    291.18x = 436.53 × 198.66
  4. Step 4: Simplify right side
    291.18x = 86,721.05
  5. Step 5: Solve for x
    x = 86,721.05/291.18
  6. Step 6: Final answer
    x = 297.83

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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.