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Finding the Fourth Proportional to 889.97, 1,228.20 and 779.26

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Solution

The fourth proportional to 889.97, 1,228.20 and 779.26 is: 1,075.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.97 : 1,228.20 = 779.26 : x
  2. Step 2: Convert to fraction form
    889.97/1,228.20 = 779.26/x
  3. Step 3: Cross multiply
    889.97x = 1,228.20 × 779.26
  4. Step 4: Simplify right side
    889.97x = 957,080.99
  5. Step 5: Solve for x
    x = 957,080.99/889.97
  6. Step 6: Final answer
    x = 1,075.41

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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.