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Finding the Fourth Proportional to 254.39, 381.50 and 100.28

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Solution

The fourth proportional to 254.39, 381.50 and 100.28 is: 150.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.39 : 381.50 = 100.28 : x
  2. Step 2: Convert to fraction form
    254.39/381.50 = 100.28/x
  3. Step 3: Cross multiply
    254.39x = 381.50 × 100.28
  4. Step 4: Simplify right side
    254.39x = 38,256.82
  5. Step 5: Solve for x
    x = 38,256.82/254.39
  6. Step 6: Final answer
    x = 150.39

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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.