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Finding the Fourth Proportional to 291.76, 400.87 and 279.04

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Solution

The fourth proportional to 291.76, 400.87 and 279.04 is: 383.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.76 : 400.87 = 279.04 : x
  2. Step 2: Convert to fraction form
    291.76/400.87 = 279.04/x
  3. Step 3: Cross multiply
    291.76x = 400.87 × 279.04
  4. Step 4: Simplify right side
    291.76x = 111,858.76
  5. Step 5: Solve for x
    x = 111,858.76/291.76
  6. Step 6: Final answer
    x = 383.39

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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.