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Finding the Fourth Proportional to 122.40, 168.94 and 70.64

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Solution

The fourth proportional to 122.40, 168.94 and 70.64 is: 97.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.40 : 168.94 = 70.64 : x
  2. Step 2: Convert to fraction form
    122.40/168.94 = 70.64/x
  3. Step 3: Cross multiply
    122.40x = 168.94 × 70.64
  4. Step 4: Simplify right side
    122.40x = 11,933.92
  5. Step 5: Solve for x
    x = 11,933.92/122.40
  6. Step 6: Final answer
    x = 97.50

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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.