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Finding the Fourth Proportional to 256.48, 384.78 and 83.19

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Solution

The fourth proportional to 256.48, 384.78 and 83.19 is: 124.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.48 : 384.78 = 83.19 : x
  2. Step 2: Convert to fraction form
    256.48/384.78 = 83.19/x
  3. Step 3: Cross multiply
    256.48x = 384.78 × 83.19
  4. Step 4: Simplify right side
    256.48x = 32,009.85
  5. Step 5: Solve for x
    x = 32,009.85/256.48
  6. Step 6: Final answer
    x = 124.80

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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.