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Finding the Fourth Proportional to 980.55, 1,353.20 and 560.88

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Solution

The fourth proportional to 980.55, 1,353.20 and 560.88 is: 774.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.55 : 1,353.20 = 560.88 : x
  2. Step 2: Convert to fraction form
    980.55/1,353.20 = 560.88/x
  3. Step 3: Cross multiply
    980.55x = 1,353.20 × 560.88
  4. Step 4: Simplify right side
    980.55x = 758,980.01
  5. Step 5: Solve for x
    x = 758,980.01/980.55
  6. Step 6: Final answer
    x = 774.03

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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.