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Finding the Fourth Proportional to 980.38, 1,352.68 and 581.80

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Solution

The fourth proportional to 980.38, 1,352.68 and 581.80 is: 802.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.38 : 1,352.68 = 581.80 : x
  2. Step 2: Convert to fraction form
    980.38/1,352.68 = 581.80/x
  3. Step 3: Cross multiply
    980.38x = 1,352.68 × 581.80
  4. Step 4: Simplify right side
    980.38x = 786,989.22
  5. Step 5: Solve for x
    x = 786,989.22/980.38
  6. Step 6: Final answer
    x = 802.74

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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.