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Finding the Fourth Proportional to 289.83, 434.85 and 211.83

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Solution

The fourth proportional to 289.83, 434.85 and 211.83 is: 317.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.83 : 434.85 = 211.83 : x
  2. Step 2: Convert to fraction form
    289.83/434.85 = 211.83/x
  3. Step 3: Cross multiply
    289.83x = 434.85 × 211.83
  4. Step 4: Simplify right side
    289.83x = 92,114.28
  5. Step 5: Solve for x
    x = 92,114.28/289.83
  6. Step 6: Final answer
    x = 317.82

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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.