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Finding the Fourth Proportional to 290.42, 400.79 and 157.64

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Solution

The fourth proportional to 290.42, 400.79 and 157.64 is: 217.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.42 : 400.79 = 157.64 : x
  2. Step 2: Convert to fraction form
    290.42/400.79 = 157.64/x
  3. Step 3: Cross multiply
    290.42x = 400.79 × 157.64
  4. Step 4: Simplify right side
    290.42x = 63,180.75
  5. Step 5: Solve for x
    x = 63,180.75/290.42
  6. Step 6: Final answer
    x = 217.55

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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.