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Finding the Fourth Proportional to 208.26, 287.28 and 153

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Solution

The fourth proportional to 208.26, 287.28 and 153 is: 211.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.26 : 287.28 = 153 : x
  2. Step 2: Convert to fraction form
    208.26/287.28 = 153/x
  3. Step 3: Cross multiply
    208.26x = 287.28 × 153
  4. Step 4: Simplify right side
    208.26x = 43,953.84
  5. Step 5: Solve for x
    x = 43,953.84/208.26
  6. Step 6: Final answer
    x = 211.05

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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.