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Finding the Fourth Proportional to 208.87, 287.47 and 153.52

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Solution

The fourth proportional to 208.87, 287.47 and 153.52 is: 211.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.87 : 287.47 = 153.52 : x
  2. Step 2: Convert to fraction form
    208.87/287.47 = 153.52/x
  3. Step 3: Cross multiply
    208.87x = 287.47 × 153.52
  4. Step 4: Simplify right side
    208.87x = 44,132.39
  5. Step 5: Solve for x
    x = 44,132.39/208.87
  6. Step 6: Final answer
    x = 211.29

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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.