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Finding the Fourth Proportional to 980.56, 1,353.18 and 631.48

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Solution

The fourth proportional to 980.56, 1,353.18 and 631.48 is: 871.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.56 : 1,353.18 = 631.48 : x
  2. Step 2: Convert to fraction form
    980.56/1,353.18 = 631.48/x
  3. Step 3: Cross multiply
    980.56x = 1,353.18 × 631.48
  4. Step 4: Simplify right side
    980.56x = 854,506.11
  5. Step 5: Solve for x
    x = 854,506.11/980.56
  6. Step 6: Final answer
    x = 871.45

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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.