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Finding the Fourth Proportional to 122.16, 168.51 and 89.37

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Solution

The fourth proportional to 122.16, 168.51 and 89.37 is: 123.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.16 : 168.51 = 89.37 : x
  2. Step 2: Convert to fraction form
    122.16/168.51 = 89.37/x
  3. Step 3: Cross multiply
    122.16x = 168.51 × 89.37
  4. Step 4: Simplify right side
    122.16x = 15,059.74
  5. Step 5: Solve for x
    x = 15,059.74/122.16
  6. Step 6: Final answer
    x = 123.28

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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.