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Finding the Fourth Proportional to 122.19, 168.60 and 72.40

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Solution

The fourth proportional to 122.19, 168.60 and 72.40 is: 99.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.19 : 168.60 = 72.40 : x
  2. Step 2: Convert to fraction form
    122.19/168.60 = 72.40/x
  3. Step 3: Cross multiply
    122.19x = 168.60 × 72.40
  4. Step 4: Simplify right side
    122.19x = 12,206.59
  5. Step 5: Solve for x
    x = 12,206.59/122.19
  6. Step 6: Final answer
    x = 99.90

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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.