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Finding the Fourth Proportional to 291.68, 402.66 and 198.40

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Solution

The fourth proportional to 291.68, 402.66 and 198.40 is: 273.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.68 : 402.66 = 198.40 : x
  2. Step 2: Convert to fraction form
    291.68/402.66 = 198.40/x
  3. Step 3: Cross multiply
    291.68x = 402.66 × 198.40
  4. Step 4: Simplify right side
    291.68x = 79,887.74
  5. Step 5: Solve for x
    x = 79,887.74/291.68
  6. Step 6: Final answer
    x = 273.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.