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Finding the Fourth Proportional to 980.11, 1,353.53 and 821.14

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Solution

The fourth proportional to 980.11, 1,353.53 and 821.14 is: 1,133.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.11 : 1,353.53 = 821.14 : x
  2. Step 2: Convert to fraction form
    980.11/1,353.53 = 821.14/x
  3. Step 3: Cross multiply
    980.11x = 1,353.53 × 821.14
  4. Step 4: Simplify right side
    980.11x = 1,111,437.62
  5. Step 5: Solve for x
    x = 1,111,437.62/980.11
  6. Step 6: Final answer
    x = 1,133.99

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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.