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Finding the Fourth Proportional to 289.45, 434.13 and 172.39

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Solution

The fourth proportional to 289.45, 434.13 and 172.39 is: 258.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.45 : 434.13 = 172.39 : x
  2. Step 2: Convert to fraction form
    289.45/434.13 = 172.39/x
  3. Step 3: Cross multiply
    289.45x = 434.13 × 172.39
  4. Step 4: Simplify right side
    289.45x = 74,839.67
  5. Step 5: Solve for x
    x = 74,839.67/289.45
  6. Step 6: Final answer
    x = 258.56

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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.