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Finding the Fourth Proportional to 980.81, 1,353.51 and 538.70

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Solution

The fourth proportional to 980.81, 1,353.51 and 538.70 is: 743.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.81 : 1,353.51 = 538.70 : x
  2. Step 2: Convert to fraction form
    980.81/1,353.51 = 538.70/x
  3. Step 3: Cross multiply
    980.81x = 1,353.51 × 538.70
  4. Step 4: Simplify right side
    980.81x = 729,139.22
  5. Step 5: Solve for x
    x = 729,139.22/980.81
  6. Step 6: Final answer
    x = 743.41

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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.