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Finding the Fourth Proportional to 111.60, 163.80 and 111.60

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Solution

The fourth proportional to 111.60, 163.80 and 111.60 is: 163.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.60 : 163.80 = 111.60 : x
  2. Step 2: Convert to fraction form
    111.60/163.80 = 111.60/x
  3. Step 3: Cross multiply
    111.60x = 163.80 × 111.60
  4. Step 4: Simplify right side
    111.60x = 18,280.08
  5. Step 5: Solve for x
    x = 18,280.08/111.60
  6. Step 6: Final answer
    x = 163.80

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.