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Finding the Fourth Proportional to 208.77, 287.97 and 130.05

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Solution

The fourth proportional to 208.77, 287.97 and 130.05 is: 179.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.77 : 287.97 = 130.05 : x
  2. Step 2: Convert to fraction form
    208.77/287.97 = 130.05/x
  3. Step 3: Cross multiply
    208.77x = 287.97 × 130.05
  4. Step 4: Simplify right side
    208.77x = 37,450.50
  5. Step 5: Solve for x
    x = 37,450.50/208.77
  6. Step 6: Final answer
    x = 179.39

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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.