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Finding the Fourth Proportional to 290.00, 399.62 and 211.16

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Solution

The fourth proportional to 290.00, 399.62 and 211.16 is: 290.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.00 : 399.62 = 211.16 : x
  2. Step 2: Convert to fraction form
    290.00/399.62 = 211.16/x
  3. Step 3: Cross multiply
    290.00x = 399.62 × 211.16
  4. Step 4: Simplify right side
    290.00x = 84,385.29
  5. Step 5: Solve for x
    x = 84,385.29/290.00
  6. Step 6: Final answer
    x = 290.98

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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.