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Finding the Fourth Proportional to 1,765.91, 2,436.96 and 980.00

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Solution

The fourth proportional to 1,765.91, 2,436.96 and 980.00 is: 1,352.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,765.91 : 2,436.96 = 980.00 : x
  2. Step 2: Convert to fraction form
    1,765.91/2,436.96 = 980.00/x
  3. Step 3: Cross multiply
    1,765.91x = 2,436.96 × 980.00
  4. Step 4: Simplify right side
    1,765.91x = 2,388,230.57
  5. Step 5: Solve for x
    x = 2,388,230.57/1,765.91
  6. Step 6: Final answer
    x = 1,352.41

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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.