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Finding the Fourth Proportional to 289.44, 399.41 and 172.98

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Solution

The fourth proportional to 289.44, 399.41 and 172.98 is: 238.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.44 : 399.41 = 172.98 : x
  2. Step 2: Convert to fraction form
    289.44/399.41 = 172.98/x
  3. Step 3: Cross multiply
    289.44x = 399.41 × 172.98
  4. Step 4: Simplify right side
    289.44x = 69,089.08
  5. Step 5: Solve for x
    x = 69,089.08/289.44
  6. Step 6: Final answer
    x = 238.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.