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Finding the Fourth Proportional to 178.63, 246.71 and 120.31

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Solution

The fourth proportional to 178.63, 246.71 and 120.31 is: 166.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.63 : 246.71 = 120.31 : x
  2. Step 2: Convert to fraction form
    178.63/246.71 = 120.31/x
  3. Step 3: Cross multiply
    178.63x = 246.71 × 120.31
  4. Step 4: Simplify right side
    178.63x = 29,681.68
  5. Step 5: Solve for x
    x = 29,681.68/178.63
  6. Step 6: Final answer
    x = 166.16

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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.