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Finding the Fourth Proportional to 299.39, 409.32 and 288.05

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Solution

The fourth proportional to 299.39, 409.32 and 288.05 is: 393.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    299.39 : 409.32 = 288.05 : x
  2. Step 2: Convert to fraction form
    299.39/409.32 = 288.05/x
  3. Step 3: Cross multiply
    299.39x = 409.32 × 288.05
  4. Step 4: Simplify right side
    299.39x = 117,904.63
  5. Step 5: Solve for x
    x = 117,904.63/299.39
  6. Step 6: Final answer
    x = 393.82

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.