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Finding the Fourth Proportional to 289.09, 433.72 and 258.46

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Solution

The fourth proportional to 289.09, 433.72 and 258.46 is: 387.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.09 : 433.72 = 258.46 : x
  2. Step 2: Convert to fraction form
    289.09/433.72 = 258.46/x
  3. Step 3: Cross multiply
    289.09x = 433.72 × 258.46
  4. Step 4: Simplify right side
    289.09x = 112,099.27
  5. Step 5: Solve for x
    x = 112,099.27/289.09
  6. Step 6: Final answer
    x = 387.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.