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Finding the Fourth Proportional to 121.69, 167.65 and 100

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Solution

The fourth proportional to 121.69, 167.65 and 100 is: 137.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.69 : 167.65 = 100 : x
  2. Step 2: Convert to fraction form
    121.69/167.65 = 100/x
  3. Step 3: Cross multiply
    121.69x = 167.65 × 100
  4. Step 4: Simplify right side
    121.69x = 16,765
  5. Step 5: Solve for x
    x = 16,765/121.69
  6. Step 6: Final answer
    x = 137.77

Related Problems

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1.5x scale

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.