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Finding the Fourth Proportional to 122.16, 168.56 and 69.70

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Solution

The fourth proportional to 122.16, 168.56 and 69.70 is: 96.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.16 : 168.56 = 69.70 : x
  2. Step 2: Convert to fraction form
    122.16/168.56 = 69.70/x
  3. Step 3: Cross multiply
    122.16x = 168.56 × 69.70
  4. Step 4: Simplify right side
    122.16x = 11,748.63
  5. Step 5: Solve for x
    x = 11,748.63/122.16
  6. Step 6: Final answer
    x = 96.17

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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.