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Finding the Fourth Proportional to 189.30, 281.98 and 186.87

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Solution

The fourth proportional to 189.30, 281.98 and 186.87 is: 278.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.30 : 281.98 = 186.87 : x
  2. Step 2: Convert to fraction form
    189.30/281.98 = 186.87/x
  3. Step 3: Cross multiply
    189.30x = 281.98 × 186.87
  4. Step 4: Simplify right side
    189.30x = 52,693.60
  5. Step 5: Solve for x
    x = 52,693.60/189.30
  6. Step 6: Final answer
    x = 278.36

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.