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Finding the Fourth Proportional to 980.67, 1,353.39 and 587.70

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Solution

The fourth proportional to 980.67, 1,353.39 and 587.70 is: 811.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.67 : 1,353.39 = 587.70 : x
  2. Step 2: Convert to fraction form
    980.67/1,353.39 = 587.70/x
  3. Step 3: Cross multiply
    980.67x = 1,353.39 × 587.70
  4. Step 4: Simplify right side
    980.67x = 795,387.30
  5. Step 5: Solve for x
    x = 795,387.30/980.67
  6. Step 6: Final answer
    x = 811.07

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1.5x scale

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.