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Finding the Fourth Proportional to 289.84, 433.92 and 172.36

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Solution

The fourth proportional to 289.84, 433.92 and 172.36 is: 258.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.84 : 433.92 = 172.36 : x
  2. Step 2: Convert to fraction form
    289.84/433.92 = 172.36/x
  3. Step 3: Cross multiply
    289.84x = 433.92 × 172.36
  4. Step 4: Simplify right side
    289.84x = 74,790.45
  5. Step 5: Solve for x
    x = 74,790.45/289.84
  6. Step 6: Final answer
    x = 258.04

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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.