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Finding the Fourth Proportional to 980.54, 1,468.91 and 774.80

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Solution

The fourth proportional to 980.54, 1,468.91 and 774.80 is: 1,160.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.54 : 1,468.91 = 774.80 : x
  2. Step 2: Convert to fraction form
    980.54/1,468.91 = 774.80/x
  3. Step 3: Cross multiply
    980.54x = 1,468.91 × 774.80
  4. Step 4: Simplify right side
    980.54x = 1,138,111.47
  5. Step 5: Solve for x
    x = 1,138,111.47/980.54
  6. Step 6: Final answer
    x = 1,160.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.