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Finding the Fourth Proportional to 112.41, 155.21 and 90.54

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Solution

The fourth proportional to 112.41, 155.21 and 90.54 is: 125.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.41 : 155.21 = 90.54 : x
  2. Step 2: Convert to fraction form
    112.41/155.21 = 90.54/x
  3. Step 3: Cross multiply
    112.41x = 155.21 × 90.54
  4. Step 4: Simplify right side
    112.41x = 14,052.26
  5. Step 5: Solve for x
    x = 14,052.26/112.41
  6. Step 6: Final answer
    x = 125.01

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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.