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Finding the Fourth Proportional to 253.97, 381.02 and 91.67

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Solution

The fourth proportional to 253.97, 381.02 and 91.67 is: 137.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.97 : 381.02 = 91.67 : x
  2. Step 2: Convert to fraction form
    253.97/381.02 = 91.67/x
  3. Step 3: Cross multiply
    253.97x = 381.02 × 91.67
  4. Step 4: Simplify right side
    253.97x = 34,925.74
  5. Step 5: Solve for x
    x = 34,925.74/253.97
  6. Step 6: Final answer
    x = 137.52

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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.