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Finding the Fourth Proportional to 979, 1,348.73 and 683.74

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Solution

The fourth proportional to 979, 1,348.73 and 683.74 is: 941.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    979 : 1,348.73 = 683.74 : x
  2. Step 2: Convert to fraction form
    979/1,348.73 = 683.74/x
  3. Step 3: Cross multiply
    979x = 1,348.73 × 683.74
  4. Step 4: Simplify right side
    979x = 922,180.65
  5. Step 5: Solve for x
    x = 922,180.65/979
  6. Step 6: Final answer
    x = 941.96

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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.