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Finding the Fourth Proportional to 216.12, 297.81 and 142.31

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Solution

The fourth proportional to 216.12, 297.81 and 142.31 is: 196.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.12 : 297.81 = 142.31 : x
  2. Step 2: Convert to fraction form
    216.12/297.81 = 142.31/x
  3. Step 3: Cross multiply
    216.12x = 297.81 × 142.31
  4. Step 4: Simplify right side
    216.12x = 42,381.34
  5. Step 5: Solve for x
    x = 42,381.34/216.12
  6. Step 6: Final answer
    x = 196.10

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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.