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Finding the Fourth Proportional to 401.21, 601.78 and 247.16

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Solution

The fourth proportional to 401.21, 601.78 and 247.16 is: 370.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.21 : 601.78 = 247.16 : x
  2. Step 2: Convert to fraction form
    401.21/601.78 = 247.16/x
  3. Step 3: Cross multiply
    401.21x = 601.78 × 247.16
  4. Step 4: Simplify right side
    401.21x = 148,735.94
  5. Step 5: Solve for x
    x = 148,735.94/401.21
  6. Step 6: Final answer
    x = 370.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.