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Finding the Fourth Proportional to 286.70, 393.30 and 279.54

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Solution

The fourth proportional to 286.70, 393.30 and 279.54 is: 383.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.70 : 393.30 = 279.54 : x
  2. Step 2: Convert to fraction form
    286.70/393.30 = 279.54/x
  3. Step 3: Cross multiply
    286.70x = 393.30 × 279.54
  4. Step 4: Simplify right side
    286.70x = 109,943.08
  5. Step 5: Solve for x
    x = 109,943.08/286.70
  6. Step 6: Final answer
    x = 383.48

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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.