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Finding the Fourth Proportional to 189.80, 284.47 and 74.18

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Solution

The fourth proportional to 189.80, 284.47 and 74.18 is: 111.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.80 : 284.47 = 74.18 : x
  2. Step 2: Convert to fraction form
    189.80/284.47 = 74.18/x
  3. Step 3: Cross multiply
    189.80x = 284.47 × 74.18
  4. Step 4: Simplify right side
    189.80x = 21,101.98
  5. Step 5: Solve for x
    x = 21,101.98/189.80
  6. Step 6: Final answer
    x = 111.18

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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.