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Finding the Fourth Proportional to 980.12, 1,471.20 and 958.08

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Solution

The fourth proportional to 980.12, 1,471.20 and 958.08 is: 1,438.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.12 : 1,471.20 = 958.08 : x
  2. Step 2: Convert to fraction form
    980.12/1,471.20 = 958.08/x
  3. Step 3: Cross multiply
    980.12x = 1,471.20 × 958.08
  4. Step 4: Simplify right side
    980.12x = 1,409,527.30
  5. Step 5: Solve for x
    x = 1,409,527.30/980.12
  6. Step 6: Final answer
    x = 1,438.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.