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Finding the Fourth Proportional to 208.38, 288.21 and 186.54

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Solution

The fourth proportional to 208.38, 288.21 and 186.54 is: 258.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.38 : 288.21 = 186.54 : x
  2. Step 2: Convert to fraction form
    208.38/288.21 = 186.54/x
  3. Step 3: Cross multiply
    208.38x = 288.21 × 186.54
  4. Step 4: Simplify right side
    208.38x = 53,762.69
  5. Step 5: Solve for x
    x = 53,762.69/208.38
  6. Step 6: Final answer
    x = 258.00

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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.