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Finding the Fourth Proportional to 189.03, 283.51 and 86.31

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Solution

The fourth proportional to 189.03, 283.51 and 86.31 is: 129.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.03 : 283.51 = 86.31 : x
  2. Step 2: Convert to fraction form
    189.03/283.51 = 86.31/x
  3. Step 3: Cross multiply
    189.03x = 283.51 × 86.31
  4. Step 4: Simplify right side
    189.03x = 24,469.75
  5. Step 5: Solve for x
    x = 24,469.75/189.03
  6. Step 6: Final answer
    x = 129.45

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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.