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Finding the Fourth Proportional to 980.40, 1,353.04 and 538.32

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Solution

The fourth proportional to 980.40, 1,353.04 and 538.32 is: 742.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.40 : 1,353.04 = 538.32 : x
  2. Step 2: Convert to fraction form
    980.40/1,353.04 = 538.32/x
  3. Step 3: Cross multiply
    980.40x = 1,353.04 × 538.32
  4. Step 4: Simplify right side
    980.40x = 728,368.49
  5. Step 5: Solve for x
    x = 728,368.49/980.40
  6. Step 6: Final answer
    x = 742.93

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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.