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Finding the Fourth Proportional to 123.24, 185.64 and 118.20

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Solution

The fourth proportional to 123.24, 185.64 and 118.20 is: 178.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.24 : 185.64 = 118.20 : x
  2. Step 2: Convert to fraction form
    123.24/185.64 = 118.20/x
  3. Step 3: Cross multiply
    123.24x = 185.64 × 118.20
  4. Step 4: Simplify right side
    123.24x = 21,942.65
  5. Step 5: Solve for x
    x = 21,942.65/123.24
  6. Step 6: Final answer
    x = 178.05

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.