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Finding the Fourth Proportional to 254.57, 381.77 and 100.45

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Solution

The fourth proportional to 254.57, 381.77 and 100.45 is: 150.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.57 : 381.77 = 100.45 : x
  2. Step 2: Convert to fraction form
    254.57/381.77 = 100.45/x
  3. Step 3: Cross multiply
    254.57x = 381.77 × 100.45
  4. Step 4: Simplify right side
    254.57x = 38,348.80
  5. Step 5: Solve for x
    x = 38,348.80/254.57
  6. Step 6: Final answer
    x = 150.64

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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.