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Finding the Fourth Proportional to 256.02, 383.48 and 212.58

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Solution

The fourth proportional to 256.02, 383.48 and 212.58 is: 318.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.02 : 383.48 = 212.58 : x
  2. Step 2: Convert to fraction form
    256.02/383.48 = 212.58/x
  3. Step 3: Cross multiply
    256.02x = 383.48 × 212.58
  4. Step 4: Simplify right side
    256.02x = 81,520.18
  5. Step 5: Solve for x
    x = 81,520.18/256.02
  6. Step 6: Final answer
    x = 318.41

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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.