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Finding the Fourth Proportional to 153.30, 212.81 and 143.58

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Solution

The fourth proportional to 153.30, 212.81 and 143.58 is: 199.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.30 : 212.81 = 143.58 : x
  2. Step 2: Convert to fraction form
    153.30/212.81 = 143.58/x
  3. Step 3: Cross multiply
    153.30x = 212.81 × 143.58
  4. Step 4: Simplify right side
    153.30x = 30,554.54
  5. Step 5: Solve for x
    x = 30,554.54/153.30
  6. Step 6: Final answer
    x = 199.31

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.