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Finding the Fourth Proportional to 979.34, 1,349.22 and 684.14

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Solution

The fourth proportional to 979.34, 1,349.22 and 684.14 is: 942.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.34 : 1,349.22 = 684.14 : x
  2. Step 2: Convert to fraction form
    979.34/1,349.22 = 684.14/x
  3. Step 3: Cross multiply
    979.34x = 1,349.22 × 684.14
  4. Step 4: Simplify right side
    979.34x = 923,055.37
  5. Step 5: Solve for x
    x = 923,055.37/979.34
  6. Step 6: Final answer
    x = 942.53

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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.