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Finding the Fourth Proportional to 255.24, 383.61 and 212.18

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Solution

The fourth proportional to 255.24, 383.61 and 212.18 is: 318.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.24 : 383.61 = 212.18 : x
  2. Step 2: Convert to fraction form
    255.24/383.61 = 212.18/x
  3. Step 3: Cross multiply
    255.24x = 383.61 × 212.18
  4. Step 4: Simplify right side
    255.24x = 81,394.37
  5. Step 5: Solve for x
    x = 81,394.37/255.24
  6. Step 6: Final answer
    x = 318.89

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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.