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Finding the Fourth Proportional to 149, 205.63 and 86.87

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Solution

The fourth proportional to 149, 205.63 and 86.87 is: 119.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    149 : 205.63 = 86.87 : x
  2. Step 2: Convert to fraction form
    149/205.63 = 86.87/x
  3. Step 3: Cross multiply
    149x = 205.63 × 86.87
  4. Step 4: Simplify right side
    149x = 17,863.08
  5. Step 5: Solve for x
    x = 17,863.08/149
  6. Step 6: Final answer
    x = 119.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.