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Finding the Fourth Proportional to 980, 1,342.62 and 943.10

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Solution

The fourth proportional to 980, 1,342.62 and 943.10 is: 1,292.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    980 : 1,342.62 = 943.10 : x
  2. Step 2: Convert to fraction form
    980/1,342.62 = 943.10/x
  3. Step 3: Cross multiply
    980x = 1,342.62 × 943.10
  4. Step 4: Simplify right side
    980x = 1,266,220.21
  5. Step 5: Solve for x
    x = 1,266,220.21/980
  6. Step 6: Final answer
    x = 1,292.06

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.