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Finding the Fourth Proportional to 153.40, 212.34 and 140.44

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Solution

The fourth proportional to 153.40, 212.34 and 140.44 is: 194.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.40 : 212.34 = 140.44 : x
  2. Step 2: Convert to fraction form
    153.40/212.34 = 140.44/x
  3. Step 3: Cross multiply
    153.40x = 212.34 × 140.44
  4. Step 4: Simplify right side
    153.40x = 29,821.03
  5. Step 5: Solve for x
    x = 29,821.03/153.40
  6. Step 6: Final answer
    x = 194.40

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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.