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Finding the Fourth Proportional to 291.12, 401.40 and 228.84

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Solution

The fourth proportional to 291.12, 401.40 and 228.84 is: 315.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.12 : 401.40 = 228.84 : x
  2. Step 2: Convert to fraction form
    291.12/401.40 = 228.84/x
  3. Step 3: Cross multiply
    291.12x = 401.40 × 228.84
  4. Step 4: Simplify right side
    291.12x = 91,856.38
  5. Step 5: Solve for x
    x = 91,856.38/291.12
  6. Step 6: Final answer
    x = 315.53

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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.