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Finding the Fourth Proportional to 253.65, 380.49 and 91.44

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Solution

The fourth proportional to 253.65, 380.49 and 91.44 is: 137.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.65 : 380.49 = 91.44 : x
  2. Step 2: Convert to fraction form
    253.65/380.49 = 91.44/x
  3. Step 3: Cross multiply
    253.65x = 380.49 × 91.44
  4. Step 4: Simplify right side
    253.65x = 34,792.01
  5. Step 5: Solve for x
    x = 34,792.01/253.65
  6. Step 6: Final answer
    x = 137.17

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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.