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Finding the Fourth Proportional to 1,172.76, 1,617.84 and 779.28

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Solution

The fourth proportional to 1,172.76, 1,617.84 and 779.28 is: 1,075.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.76 : 1,617.84 = 779.28 : x
  2. Step 2: Convert to fraction form
    1,172.76/1,617.84 = 779.28/x
  3. Step 3: Cross multiply
    1,172.76x = 1,617.84 × 779.28
  4. Step 4: Simplify right side
    1,172.76x = 1,260,750.36
  5. Step 5: Solve for x
    x = 1,260,750.36/1,172.76
  6. Step 6: Final answer
    x = 1,075.03

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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.