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Finding the Fourth Proportional to 189.25, 283.62 and 128.77

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Solution

The fourth proportional to 189.25, 283.62 and 128.77 is: 192.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.25 : 283.62 = 128.77 : x
  2. Step 2: Convert to fraction form
    189.25/283.62 = 128.77/x
  3. Step 3: Cross multiply
    189.25x = 283.62 × 128.77
  4. Step 4: Simplify right side
    189.25x = 36,521.75
  5. Step 5: Solve for x
    x = 36,521.75/189.25
  6. Step 6: Final answer
    x = 192.98

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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.