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Finding the Fourth Proportional to 256.47, 384.45 and 119.48

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Solution

The fourth proportional to 256.47, 384.45 and 119.48 is: 179.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.47 : 384.45 = 119.48 : x
  2. Step 2: Convert to fraction form
    256.47/384.45 = 119.48/x
  3. Step 3: Cross multiply
    256.47x = 384.45 × 119.48
  4. Step 4: Simplify right side
    256.47x = 45,931.72
  5. Step 5: Solve for x
    x = 45,931.72/256.47
  6. Step 6: Final answer
    x = 179.09

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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.