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Finding the Fourth Proportional to 208.19, 287.43 and 149.30

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Solution

The fourth proportional to 208.19, 287.43 and 149.30 is: 206.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.19 : 287.43 = 149.30 : x
  2. Step 2: Convert to fraction form
    208.19/287.43 = 149.30/x
  3. Step 3: Cross multiply
    208.19x = 287.43 × 149.30
  4. Step 4: Simplify right side
    208.19x = 42,911.86
  5. Step 5: Solve for x
    x = 42,911.86/208.19
  6. Step 6: Final answer
    x = 206.12

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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.