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Finding the Fourth Proportional to 208.41, 287.55 and 121.07

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Solution

The fourth proportional to 208.41, 287.55 and 121.07 is: 167.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.41 : 287.55 = 121.07 : x
  2. Step 2: Convert to fraction form
    208.41/287.55 = 121.07/x
  3. Step 3: Cross multiply
    208.41x = 287.55 × 121.07
  4. Step 4: Simplify right side
    208.41x = 34,812.24
  5. Step 5: Solve for x
    x = 34,812.24/208.41
  6. Step 6: Final answer
    x = 167.04

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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.