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Finding the Fourth Proportional to 143.70, 215.79 and 118.05

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Solution

The fourth proportional to 143.70, 215.79 and 118.05 is: 177.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.70 : 215.79 = 118.05 : x
  2. Step 2: Convert to fraction form
    143.70/215.79 = 118.05/x
  3. Step 3: Cross multiply
    143.70x = 215.79 × 118.05
  4. Step 4: Simplify right side
    143.70x = 25,474.01
  5. Step 5: Solve for x
    x = 25,474.01/143.70
  6. Step 6: Final answer
    x = 177.27

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.