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Finding the Fourth Proportional to 154.36, 213.13 and 123.45

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Solution

The fourth proportional to 154.36, 213.13 and 123.45 is: 170.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.36 : 213.13 = 123.45 : x
  2. Step 2: Convert to fraction form
    154.36/213.13 = 123.45/x
  3. Step 3: Cross multiply
    154.36x = 213.13 × 123.45
  4. Step 4: Simplify right side
    154.36x = 26,309.83
  5. Step 5: Solve for x
    x = 26,309.83/154.36
  6. Step 6: Final answer
    x = 170.44

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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.