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Finding the Fourth Proportional to 980.42, 1,353.04 and 685.58

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Solution

The fourth proportional to 980.42, 1,353.04 and 685.58 is: 946.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.42 : 1,353.04 = 685.58 : x
  2. Step 2: Convert to fraction form
    980.42/1,353.04 = 685.58/x
  3. Step 3: Cross multiply
    980.42x = 1,353.04 × 685.58
  4. Step 4: Simplify right side
    980.42x = 927,608.68
  5. Step 5: Solve for x
    x = 927,608.68/980.42
  6. Step 6: Final answer
    x = 946.14

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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.