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Finding the Fourth Proportional to 285.64, 394.16 and 161.28

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Solution

The fourth proportional to 285.64, 394.16 and 161.28 is: 222.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.64 : 394.16 = 161.28 : x
  2. Step 2: Convert to fraction form
    285.64/394.16 = 161.28/x
  3. Step 3: Cross multiply
    285.64x = 394.16 × 161.28
  4. Step 4: Simplify right side
    285.64x = 63,570.12
  5. Step 5: Solve for x
    x = 63,570.12/285.64
  6. Step 6: Final answer
    x = 222.55

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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.