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Finding the Fourth Proportional to 289.79, 433.65 and 251.72

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Solution

The fourth proportional to 289.79, 433.65 and 251.72 is: 376.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.79 : 433.65 = 251.72 : x
  2. Step 2: Convert to fraction form
    289.79/433.65 = 251.72/x
  3. Step 3: Cross multiply
    289.79x = 433.65 × 251.72
  4. Step 4: Simplify right side
    289.79x = 109,158.38
  5. Step 5: Solve for x
    x = 109,158.38/289.79
  6. Step 6: Final answer
    x = 376.68

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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.