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Finding the Fourth Proportional to 253.36, 379.93 and 90.94

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Solution

The fourth proportional to 253.36, 379.93 and 90.94 is: 136.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.36 : 379.93 = 90.94 : x
  2. Step 2: Convert to fraction form
    253.36/379.93 = 90.94/x
  3. Step 3: Cross multiply
    253.36x = 379.93 × 90.94
  4. Step 4: Simplify right side
    253.36x = 34,550.83
  5. Step 5: Solve for x
    x = 34,550.83/253.36
  6. Step 6: Final answer
    x = 136.37

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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.