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Finding the Fourth Proportional to 256.63, 384.64 and 211.07

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Solution

The fourth proportional to 256.63, 384.64 and 211.07 is: 316.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.63 : 384.64 = 211.07 : x
  2. Step 2: Convert to fraction form
    256.63/384.64 = 211.07/x
  3. Step 3: Cross multiply
    256.63x = 384.64 × 211.07
  4. Step 4: Simplify right side
    256.63x = 81,185.96
  5. Step 5: Solve for x
    x = 81,185.96/256.63
  6. Step 6: Final answer
    x = 316.35

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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.