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Finding the Fourth Proportional to 296.88, 409.55 and 198.78

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Solution

The fourth proportional to 296.88, 409.55 and 198.78 is: 274.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    296.88 : 409.55 = 198.78 : x
  2. Step 2: Convert to fraction form
    296.88/409.55 = 198.78/x
  3. Step 3: Cross multiply
    296.88x = 409.55 × 198.78
  4. Step 4: Simplify right side
    296.88x = 81,409.36
  5. Step 5: Solve for x
    x = 81,409.36/296.88
  6. Step 6: Final answer
    x = 274.22

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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.