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Finding the Fourth Proportional to 230.31, 317.43 and 189

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Solution

The fourth proportional to 230.31, 317.43 and 189 is: 260.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    230.31 : 317.43 = 189 : x
  2. Step 2: Convert to fraction form
    230.31/317.43 = 189/x
  3. Step 3: Cross multiply
    230.31x = 317.43 × 189
  4. Step 4: Simplify right side
    230.31x = 59,994.27
  5. Step 5: Solve for x
    x = 59,994.27/230.31
  6. Step 6: Final answer
    x = 260.49

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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.