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Finding the Fourth Proportional to 289.47, 399.48 and 191.19

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Solution

The fourth proportional to 289.47, 399.48 and 191.19 is: 263.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.47 : 399.48 = 191.19 : x
  2. Step 2: Convert to fraction form
    289.47/399.48 = 191.19/x
  3. Step 3: Cross multiply
    289.47x = 399.48 × 191.19
  4. Step 4: Simplify right side
    289.47x = 76,376.58
  5. Step 5: Solve for x
    x = 76,376.58/289.47
  6. Step 6: Final answer
    x = 263.85

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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.