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Finding the Fourth Proportional to 100.40, 149.88 and 82.37

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Solution

The fourth proportional to 100.40, 149.88 and 82.37 is: 122.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.40 : 149.88 = 82.37 : x
  2. Step 2: Convert to fraction form
    100.40/149.88 = 82.37/x
  3. Step 3: Cross multiply
    100.40x = 149.88 × 82.37
  4. Step 4: Simplify right side
    100.40x = 12,345.84
  5. Step 5: Solve for x
    x = 12,345.84/100.40
  6. Step 6: Final answer
    x = 122.97

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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.