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Finding the Fourth Proportional to 291.61, 401.67 and 208.57

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Solution

The fourth proportional to 291.61, 401.67 and 208.57 is: 287.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.61 : 401.67 = 208.57 : x
  2. Step 2: Convert to fraction form
    291.61/401.67 = 208.57/x
  3. Step 3: Cross multiply
    291.61x = 401.67 × 208.57
  4. Step 4: Simplify right side
    291.61x = 83,776.31
  5. Step 5: Solve for x
    x = 83,776.31/291.61
  6. Step 6: Final answer
    x = 287.29

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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.