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Finding the Fourth Proportional to 289.65, 399.78 and 191.42

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Solution

The fourth proportional to 289.65, 399.78 and 191.42 is: 264.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.65 : 399.78 = 191.42 : x
  2. Step 2: Convert to fraction form
    289.65/399.78 = 191.42/x
  3. Step 3: Cross multiply
    289.65x = 399.78 × 191.42
  4. Step 4: Simplify right side
    289.65x = 76,525.89
  5. Step 5: Solve for x
    x = 76,525.89/289.65
  6. Step 6: Final answer
    x = 264.20

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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.