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Finding the Fourth Proportional to 212.60, 318.93 and 82.60

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Solution

The fourth proportional to 212.60, 318.93 and 82.60 is: 123.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.60 : 318.93 = 82.60 : x
  2. Step 2: Convert to fraction form
    212.60/318.93 = 82.60/x
  3. Step 3: Cross multiply
    212.60x = 318.93 × 82.60
  4. Step 4: Simplify right side
    212.60x = 26,343.62
  5. Step 5: Solve for x
    x = 26,343.62/212.60
  6. Step 6: Final answer
    x = 123.91

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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.