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Finding the Fourth Proportional to 291.56, 434.74 and 287.96

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Solution

The fourth proportional to 291.56, 434.74 and 287.96 is: 429.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.56 : 434.74 = 287.96 : x
  2. Step 2: Convert to fraction form
    291.56/434.74 = 287.96/x
  3. Step 3: Cross multiply
    291.56x = 434.74 × 287.96
  4. Step 4: Simplify right side
    291.56x = 125,187.73
  5. Step 5: Solve for x
    x = 125,187.73/291.56
  6. Step 6: Final answer
    x = 429.37

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.