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Finding the Fourth Proportional to 980.33, 1,352.61 and 717.89

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Solution

The fourth proportional to 980.33, 1,352.61 and 717.89 is: 990.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.33 : 1,352.61 = 717.89 : x
  2. Step 2: Convert to fraction form
    980.33/1,352.61 = 717.89/x
  3. Step 3: Cross multiply
    980.33x = 1,352.61 × 717.89
  4. Step 4: Simplify right side
    980.33x = 971,025.19
  5. Step 5: Solve for x
    x = 971,025.19/980.33
  6. Step 6: Final answer
    x = 990.51

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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.