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Finding the Fourth Proportional to 189.70, 284.32 and 121.08

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Solution

The fourth proportional to 189.70, 284.32 and 121.08 is: 181.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.70 : 284.32 = 121.08 : x
  2. Step 2: Convert to fraction form
    189.70/284.32 = 121.08/x
  3. Step 3: Cross multiply
    189.70x = 284.32 × 121.08
  4. Step 4: Simplify right side
    189.70x = 34,425.47
  5. Step 5: Solve for x
    x = 34,425.47/189.70
  6. Step 6: Final answer
    x = 181.47

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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.