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Finding the Fourth Proportional to 255.76, 384.30 and 212.56

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Solution

The fourth proportional to 255.76, 384.30 and 212.56 is: 319.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.76 : 384.30 = 212.56 : x
  2. Step 2: Convert to fraction form
    255.76/384.30 = 212.56/x
  3. Step 3: Cross multiply
    255.76x = 384.30 × 212.56
  4. Step 4: Simplify right side
    255.76x = 81,686.81
  5. Step 5: Solve for x
    x = 81,686.81/255.76
  6. Step 6: Final answer
    x = 319.39

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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.