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Finding the Fourth Proportional to 256.34, 384.49 and 83.13

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Solution

The fourth proportional to 256.34, 384.49 and 83.13 is: 124.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.34 : 384.49 = 83.13 : x
  2. Step 2: Convert to fraction form
    256.34/384.49 = 83.13/x
  3. Step 3: Cross multiply
    256.34x = 384.49 × 83.13
  4. Step 4: Simplify right side
    256.34x = 31,962.24
  5. Step 5: Solve for x
    x = 31,962.24/256.34
  6. Step 6: Final answer
    x = 124.69

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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.