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Finding the Fourth Proportional to 190.31, 285.40 and 118.09

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Solution

The fourth proportional to 190.31, 285.40 and 118.09 is: 177.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.31 : 285.40 = 118.09 : x
  2. Step 2: Convert to fraction form
    190.31/285.40 = 118.09/x
  3. Step 3: Cross multiply
    190.31x = 285.40 × 118.09
  4. Step 4: Simplify right side
    190.31x = 33,700.87
  5. Step 5: Solve for x
    x = 33,700.87/190.31
  6. Step 6: Final answer
    x = 177.08

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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.