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Finding the Fourth Proportional to 290.48, 400.79 and 206.70

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Solution

The fourth proportional to 290.48, 400.79 and 206.70 is: 285.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.48 : 400.79 = 206.70 : x
  2. Step 2: Convert to fraction form
    290.48/400.79 = 206.70/x
  3. Step 3: Cross multiply
    290.48x = 400.79 × 206.70
  4. Step 4: Simplify right side
    290.48x = 82,842.26
  5. Step 5: Solve for x
    x = 82,842.26/290.48
  6. Step 6: Final answer
    x = 285.20

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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.