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Finding the Fourth Proportional to 208.86, 312.88 and 117.28

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Solution

The fourth proportional to 208.86, 312.88 and 117.28 is: 175.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.86 : 312.88 = 117.28 : x
  2. Step 2: Convert to fraction form
    208.86/312.88 = 117.28/x
  3. Step 3: Cross multiply
    208.86x = 312.88 × 117.28
  4. Step 4: Simplify right side
    208.86x = 36,694.57
  5. Step 5: Solve for x
    x = 36,694.57/208.86
  6. Step 6: Final answer
    x = 175.69

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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.