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Finding the Fourth Proportional to 980.60, 1,353.29 and 648.45

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Solution

The fourth proportional to 980.60, 1,353.29 and 648.45 is: 894.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.60 : 1,353.29 = 648.45 : x
  2. Step 2: Convert to fraction form
    980.60/1,353.29 = 648.45/x
  3. Step 3: Cross multiply
    980.60x = 1,353.29 × 648.45
  4. Step 4: Simplify right side
    980.60x = 877,540.90
  5. Step 5: Solve for x
    x = 877,540.90/980.60
  6. Step 6: Final answer
    x = 894.90

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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.