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Finding the Fourth Proportional to 208.64, 313.01 and 86.84

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Solution

The fourth proportional to 208.64, 313.01 and 86.84 is: 130.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.64 : 313.01 = 86.84 : x
  2. Step 2: Convert to fraction form
    208.64/313.01 = 86.84/x
  3. Step 3: Cross multiply
    208.64x = 313.01 × 86.84
  4. Step 4: Simplify right side
    208.64x = 27,179.79
  5. Step 5: Solve for x
    x = 27,179.79/208.64
  6. Step 6: Final answer
    x = 130.27

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.