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Finding the Fourth Proportional to 230.23, 317.70 and 142.90

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Solution

The fourth proportional to 230.23, 317.70 and 142.90 is: 197.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    230.23 : 317.70 = 142.90 : x
  2. Step 2: Convert to fraction form
    230.23/317.70 = 142.90/x
  3. Step 3: Cross multiply
    230.23x = 317.70 × 142.90
  4. Step 4: Simplify right side
    230.23x = 45,399.33
  5. Step 5: Solve for x
    x = 45,399.33/230.23
  6. Step 6: Final answer
    x = 197.19

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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.