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Finding the Fourth Proportional to 246.40, 339.98 and 142.90

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Solution

The fourth proportional to 246.40, 339.98 and 142.90 is: 197.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    246.40 : 339.98 = 142.90 : x
  2. Step 2: Convert to fraction form
    246.40/339.98 = 142.90/x
  3. Step 3: Cross multiply
    246.40x = 339.98 × 142.90
  4. Step 4: Simplify right side
    246.40x = 48,583.14
  5. Step 5: Solve for x
    x = 48,583.14/246.40
  6. Step 6: Final answer
    x = 197.17

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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.