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Finding the Fourth Proportional to 291.98, 402.06 and 208.94

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Solution

The fourth proportional to 291.98, 402.06 and 208.94 is: 287.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.98 : 402.06 = 208.94 : x
  2. Step 2: Convert to fraction form
    291.98/402.06 = 208.94/x
  3. Step 3: Cross multiply
    291.98x = 402.06 × 208.94
  4. Step 4: Simplify right side
    291.98x = 84,007.36
  5. Step 5: Solve for x
    x = 84,007.36/291.98
  6. Step 6: Final answer
    x = 287.72

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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.