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Finding the Fourth Proportional to 291.36, 400.78 and 235.98

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Solution

The fourth proportional to 291.36, 400.78 and 235.98 is: 324.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.36 : 400.78 = 235.98 : x
  2. Step 2: Convert to fraction form
    291.36/400.78 = 235.98/x
  3. Step 3: Cross multiply
    291.36x = 400.78 × 235.98
  4. Step 4: Simplify right side
    291.36x = 94,576.36
  5. Step 5: Solve for x
    x = 94,576.36/291.36
  6. Step 6: Final answer
    x = 324.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.