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Finding the Fourth Proportional to 140.70, 212.16 and 120.63

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Solution

The fourth proportional to 140.70, 212.16 and 120.63 is: 181.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.70 : 212.16 = 120.63 : x
  2. Step 2: Convert to fraction form
    140.70/212.16 = 120.63/x
  3. Step 3: Cross multiply
    140.70x = 212.16 × 120.63
  4. Step 4: Simplify right side
    140.70x = 25,592.86
  5. Step 5: Solve for x
    x = 25,592.86/140.70
  6. Step 6: Final answer
    x = 181.90

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.