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Finding the Fourth Proportional to 289.80, 434.31 and 107.02

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Solution

The fourth proportional to 289.80, 434.31 and 107.02 is: 160.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.80 : 434.31 = 107.02 : x
  2. Step 2: Convert to fraction form
    289.80/434.31 = 107.02/x
  3. Step 3: Cross multiply
    289.80x = 434.31 × 107.02
  4. Step 4: Simplify right side
    289.80x = 46,479.86
  5. Step 5: Solve for x
    x = 46,479.86/289.80
  6. Step 6: Final answer
    x = 160.39

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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.