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Finding the Fourth Proportional to 98.24, 146.70 and 86.09

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Solution

The fourth proportional to 98.24, 146.70 and 86.09 is: 128.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.24 : 146.70 = 86.09 : x
  2. Step 2: Convert to fraction form
    98.24/146.70 = 86.09/x
  3. Step 3: Cross multiply
    98.24x = 146.70 × 86.09
  4. Step 4: Simplify right side
    98.24x = 12,629.40
  5. Step 5: Solve for x
    x = 12,629.40/98.24
  6. Step 6: Final answer
    x = 128.56

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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.