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Finding the Fourth Proportional to 254.51, 381.71 and 71.89

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Solution

The fourth proportional to 254.51, 381.71 and 71.89 is: 107.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.51 : 381.71 = 71.89 : x
  2. Step 2: Convert to fraction form
    254.51/381.71 = 71.89/x
  3. Step 3: Cross multiply
    254.51x = 381.71 × 71.89
  4. Step 4: Simplify right side
    254.51x = 27,440.36
  5. Step 5: Solve for x
    x = 27,440.36/254.51
  6. Step 6: Final answer
    x = 107.82

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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.