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Finding the Fourth Proportional to 121.65, 182.70 and 103.47

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Solution

The fourth proportional to 121.65, 182.70 and 103.47 is: 155.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.65 : 182.70 = 103.47 : x
  2. Step 2: Convert to fraction form
    121.65/182.70 = 103.47/x
  3. Step 3: Cross multiply
    121.65x = 182.70 × 103.47
  4. Step 4: Simplify right side
    121.65x = 18,903.97
  5. Step 5: Solve for x
    x = 18,903.97/121.65
  6. Step 6: Final answer
    x = 155.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.