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Finding the Fourth Proportional to 289.86, 434.48 and 220.46

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Solution

The fourth proportional to 289.86, 434.48 and 220.46 is: 330.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.86 : 434.48 = 220.46 : x
  2. Step 2: Convert to fraction form
    289.86/434.48 = 220.46/x
  3. Step 3: Cross multiply
    289.86x = 434.48 × 220.46
  4. Step 4: Simplify right side
    289.86x = 95,785.46
  5. Step 5: Solve for x
    x = 95,785.46/289.86
  6. Step 6: Final answer
    x = 330.45

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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.