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Finding the Fourth Proportional to 980.30, 1,352.90 and 587.45

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Solution

The fourth proportional to 980.30, 1,352.90 and 587.45 is: 810.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.30 : 1,352.90 = 587.45 : x
  2. Step 2: Convert to fraction form
    980.30/1,352.90 = 587.45/x
  3. Step 3: Cross multiply
    980.30x = 1,352.90 × 587.45
  4. Step 4: Simplify right side
    980.30x = 794,765.96
  5. Step 5: Solve for x
    x = 794,765.96/980.30
  6. Step 6: Final answer
    x = 810.74

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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.