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Finding the Fourth Proportional to 189.38, 284.23 and 128.59

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Solution

The fourth proportional to 189.38, 284.23 and 128.59 is: 192.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.38 : 284.23 = 128.59 : x
  2. Step 2: Convert to fraction form
    189.38/284.23 = 128.59/x
  3. Step 3: Cross multiply
    189.38x = 284.23 × 128.59
  4. Step 4: Simplify right side
    189.38x = 36,549.14
  5. Step 5: Solve for x
    x = 36,549.14/189.38
  6. Step 6: Final answer
    x = 192.99

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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.