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Finding the Fourth Proportional to 208.53, 287.71 and 134.87

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Solution

The fourth proportional to 208.53, 287.71 and 134.87 is: 186.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.53 : 287.71 = 134.87 : x
  2. Step 2: Convert to fraction form
    208.53/287.71 = 134.87/x
  3. Step 3: Cross multiply
    208.53x = 287.71 × 134.87
  4. Step 4: Simplify right side
    208.53x = 38,803.83
  5. Step 5: Solve for x
    x = 38,803.83/208.53
  6. Step 6: Final answer
    x = 186.08

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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.