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Finding the Fourth Proportional to 291.21, 401.87 and 160.22

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Solution

The fourth proportional to 291.21, 401.87 and 160.22 is: 221.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.21 : 401.87 = 160.22 : x
  2. Step 2: Convert to fraction form
    291.21/401.87 = 160.22/x
  3. Step 3: Cross multiply
    291.21x = 401.87 × 160.22
  4. Step 4: Simplify right side
    291.21x = 64,389.02
  5. Step 5: Solve for x
    x = 64,389.02/291.21
  6. Step 6: Final answer
    x = 221.11

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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.