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Finding the Fourth Proportional to 208.05, 287.06 and 130.38

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Solution

The fourth proportional to 208.05, 287.06 and 130.38 is: 179.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.05 : 287.06 = 130.38 : x
  2. Step 2: Convert to fraction form
    208.05/287.06 = 130.38/x
  3. Step 3: Cross multiply
    208.05x = 287.06 × 130.38
  4. Step 4: Simplify right side
    208.05x = 37,425.45
  5. Step 5: Solve for x
    x = 37,425.45/208.05
  6. Step 6: Final answer
    x = 179.89

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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.