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Finding the Fourth Proportional to 212.08, 317.76 and 139.84

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Solution

The fourth proportional to 212.08, 317.76 and 139.84 is: 209.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.08 : 317.76 = 139.84 : x
  2. Step 2: Convert to fraction form
    212.08/317.76 = 139.84/x
  3. Step 3: Cross multiply
    212.08x = 317.76 × 139.84
  4. Step 4: Simplify right side
    212.08x = 44,435.56
  5. Step 5: Solve for x
    x = 44,435.56/212.08
  6. Step 6: Final answer
    x = 209.52

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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.