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Finding the Fourth Proportional to 98.81, 147.90 and 82.41

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Solution

The fourth proportional to 98.81, 147.90 and 82.41 is: 123.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.81 : 147.90 = 82.41 : x
  2. Step 2: Convert to fraction form
    98.81/147.90 = 82.41/x
  3. Step 3: Cross multiply
    98.81x = 147.90 × 82.41
  4. Step 4: Simplify right side
    98.81x = 12,188.44
  5. Step 5: Solve for x
    x = 12,188.44/98.81
  6. Step 6: Final answer
    x = 123.35

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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.