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Finding the Fourth Proportional to 291.12, 401.94 and 229.20

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Solution

The fourth proportional to 291.12, 401.94 and 229.20 is: 316.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.12 : 401.94 = 229.20 : x
  2. Step 2: Convert to fraction form
    291.12/401.94 = 229.20/x
  3. Step 3: Cross multiply
    291.12x = 401.94 × 229.20
  4. Step 4: Simplify right side
    291.12x = 92,124.65
  5. Step 5: Solve for x
    x = 92,124.65/291.12
  6. Step 6: Final answer
    x = 316.45

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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.