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Finding the Fourth Proportional to 208, 287.04 and 129.40

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Solution

The fourth proportional to 208, 287.04 and 129.40 is: 178.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    208 : 287.04 = 129.40 : x
  2. Step 2: Convert to fraction form
    208/287.04 = 129.40/x
  3. Step 3: Cross multiply
    208x = 287.04 × 129.40
  4. Step 4: Simplify right side
    208x = 37,142.98
  5. Step 5: Solve for x
    x = 37,142.98/208
  6. Step 6: Final answer
    x = 178.57

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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.