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Finding the Fourth Proportional to 289.63, 434.45 and 73.21

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Solution

The fourth proportional to 289.63, 434.45 and 73.21 is: 109.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.63 : 434.45 = 73.21 : x
  2. Step 2: Convert to fraction form
    289.63/434.45 = 73.21/x
  3. Step 3: Cross multiply
    289.63x = 434.45 × 73.21
  4. Step 4: Simplify right side
    289.63x = 31,803.55
  5. Step 5: Solve for x
    x = 31,803.55/289.63
  6. Step 6: Final answer
    x = 109.81

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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.