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Finding the Fourth Proportional to 289.26, 434.21 and 288.09

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Solution

The fourth proportional to 289.26, 434.21 and 288.09 is: 432.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.26 : 434.21 = 288.09 : x
  2. Step 2: Convert to fraction form
    289.26/434.21 = 288.09/x
  3. Step 3: Cross multiply
    289.26x = 434.21 × 288.09
  4. Step 4: Simplify right side
    289.26x = 125,090.12
  5. Step 5: Solve for x
    x = 125,090.12/289.26
  6. Step 6: Final answer
    x = 432.45

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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.