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Finding the Fourth Proportional to 289.36, 434.15 and 106.76

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Solution

The fourth proportional to 289.36, 434.15 and 106.76 is: 160.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.36 : 434.15 = 106.76 : x
  2. Step 2: Convert to fraction form
    289.36/434.15 = 106.76/x
  3. Step 3: Cross multiply
    289.36x = 434.15 × 106.76
  4. Step 4: Simplify right side
    289.36x = 46,351.42
  5. Step 5: Solve for x
    x = 46,351.42/289.36
  6. Step 6: Final answer
    x = 160.19

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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.