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Finding the Fourth Proportional to 291.44, 400.44 and 258.64

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Solution

The fourth proportional to 291.44, 400.44 and 258.64 is: 355.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.44 : 400.44 = 258.64 : x
  2. Step 2: Convert to fraction form
    291.44/400.44 = 258.64/x
  3. Step 3: Cross multiply
    291.44x = 400.44 × 258.64
  4. Step 4: Simplify right side
    291.44x = 103,569.80
  5. Step 5: Solve for x
    x = 103,569.80/291.44
  6. Step 6: Final answer
    x = 355.37

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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.