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Finding the Fourth Proportional to 254.25, 381.55 and 89.72

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Solution

The fourth proportional to 254.25, 381.55 and 89.72 is: 134.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.25 : 381.55 = 89.72 : x
  2. Step 2: Convert to fraction form
    254.25/381.55 = 89.72/x
  3. Step 3: Cross multiply
    254.25x = 381.55 × 89.72
  4. Step 4: Simplify right side
    254.25x = 34,232.67
  5. Step 5: Solve for x
    x = 34,232.67/254.25
  6. Step 6: Final answer
    x = 134.64

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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.