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Finding the Fourth Proportional to 208.37, 312.65 and 117.11

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Solution

The fourth proportional to 208.37, 312.65 and 117.11 is: 175.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.37 : 312.65 = 117.11 : x
  2. Step 2: Convert to fraction form
    208.37/312.65 = 117.11/x
  3. Step 3: Cross multiply
    208.37x = 312.65 × 117.11
  4. Step 4: Simplify right side
    208.37x = 36,612.29
  5. Step 5: Solve for x
    x = 36,612.29/208.37
  6. Step 6: Final answer
    x = 175.71

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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.