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Finding the Fourth Proportional to 980.54, 1,352.84 and 631.42

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Solution

The fourth proportional to 980.54, 1,352.84 and 631.42 is: 871.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.54 : 1,352.84 = 631.42 : x
  2. Step 2: Convert to fraction form
    980.54/1,352.84 = 631.42/x
  3. Step 3: Cross multiply
    980.54x = 1,352.84 × 631.42
  4. Step 4: Simplify right side
    980.54x = 854,210.23
  5. Step 5: Solve for x
    x = 854,210.23/980.54
  6. Step 6: Final answer
    x = 871.16

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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.