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Finding the Fourth Proportional to 289.23, 399.09 and 191.01

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Solution

The fourth proportional to 289.23, 399.09 and 191.01 is: 263.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.23 : 399.09 = 191.01 : x
  2. Step 2: Convert to fraction form
    289.23/399.09 = 191.01/x
  3. Step 3: Cross multiply
    289.23x = 399.09 × 191.01
  4. Step 4: Simplify right side
    289.23x = 76,230.18
  5. Step 5: Solve for x
    x = 76,230.18/289.23
  6. Step 6: Final answer
    x = 263.56

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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.