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Finding the Fourth Proportional to 289.36, 434.32 and 221.28

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Solution

The fourth proportional to 289.36, 434.32 and 221.28 is: 332.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.36 : 434.32 = 221.28 : x
  2. Step 2: Convert to fraction form
    289.36/434.32 = 221.28/x
  3. Step 3: Cross multiply
    289.36x = 434.32 × 221.28
  4. Step 4: Simplify right side
    289.36x = 96,106.33
  5. Step 5: Solve for x
    x = 96,106.33/289.36
  6. Step 6: Final answer
    x = 332.13

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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.