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Finding the Fourth Proportional to 291.14, 401.78 and 160.16

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Solution

The fourth proportional to 291.14, 401.78 and 160.16 is: 221.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.14 : 401.78 = 160.16 : x
  2. Step 2: Convert to fraction form
    291.14/401.78 = 160.16/x
  3. Step 3: Cross multiply
    291.14x = 401.78 × 160.16
  4. Step 4: Simplify right side
    291.14x = 64,349.08
  5. Step 5: Solve for x
    x = 64,349.08/291.14
  6. Step 6: Final answer
    x = 221.02

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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.