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Finding the Fourth Proportional to 256.66, 384.89 and 135.03

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Solution

The fourth proportional to 256.66, 384.89 and 135.03 is: 202.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.66 : 384.89 = 135.03 : x
  2. Step 2: Convert to fraction form
    256.66/384.89 = 135.03/x
  3. Step 3: Cross multiply
    256.66x = 384.89 × 135.03
  4. Step 4: Simplify right side
    256.66x = 51,971.70
  5. Step 5: Solve for x
    x = 51,971.70/256.66
  6. Step 6: Final answer
    x = 202.49

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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.