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Finding the Fourth Proportional to 289.84, 399.60 and 220

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Solution

The fourth proportional to 289.84, 399.60 and 220 is: 303.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.84 : 399.60 = 220 : x
  2. Step 2: Convert to fraction form
    289.84/399.60 = 220/x
  3. Step 3: Cross multiply
    289.84x = 399.60 × 220
  4. Step 4: Simplify right side
    289.84x = 87,912
  5. Step 5: Solve for x
    x = 87,912/289.84
  6. Step 6: Final answer
    x = 303.31

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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.