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Finding the Fourth Proportional to 98.21, 146.61 and 86.06

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Solution

The fourth proportional to 98.21, 146.61 and 86.06 is: 128.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.21 : 146.61 = 86.06 : x
  2. Step 2: Convert to fraction form
    98.21/146.61 = 86.06/x
  3. Step 3: Cross multiply
    98.21x = 146.61 × 86.06
  4. Step 4: Simplify right side
    98.21x = 12,617.62
  5. Step 5: Solve for x
    x = 12,617.62/98.21
  6. Step 6: Final answer
    x = 128.47

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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.