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Finding the Fourth Proportional to 189.30, 283.91 and 128.42

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Solution

The fourth proportional to 189.30, 283.91 and 128.42 is: 192.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.30 : 283.91 = 128.42 : x
  2. Step 2: Convert to fraction form
    189.30/283.91 = 128.42/x
  3. Step 3: Cross multiply
    189.30x = 283.91 × 128.42
  4. Step 4: Simplify right side
    189.30x = 36,457.66
  5. Step 5: Solve for x
    x = 36,457.66/189.30
  6. Step 6: Final answer
    x = 192.59

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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.