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Finding the Fourth Proportional to 212.48, 318.86 and 131.07

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Solution

The fourth proportional to 212.48, 318.86 and 131.07 is: 196.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.48 : 318.86 = 131.07 : x
  2. Step 2: Convert to fraction form
    212.48/318.86 = 131.07/x
  3. Step 3: Cross multiply
    212.48x = 318.86 × 131.07
  4. Step 4: Simplify right side
    212.48x = 41,792.98
  5. Step 5: Solve for x
    x = 41,792.98/212.48
  6. Step 6: Final answer
    x = 196.69

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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.