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Finding the Fourth Proportional to 189.51, 284.20 and 128.69

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Solution

The fourth proportional to 189.51, 284.20 and 128.69 is: 192.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.51 : 284.20 = 128.69 : x
  2. Step 2: Convert to fraction form
    189.51/284.20 = 128.69/x
  3. Step 3: Cross multiply
    189.51x = 284.20 × 128.69
  4. Step 4: Simplify right side
    189.51x = 36,574.09
  5. Step 5: Solve for x
    x = 36,574.09/189.51
  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.