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Finding the Fourth Proportional to 1,172.24, 1,618.72 and 779.12

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Solution

The fourth proportional to 1,172.24, 1,618.72 and 779.12 is: 1,075.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.24 : 1,618.72 = 779.12 : x
  2. Step 2: Convert to fraction form
    1,172.24/1,618.72 = 779.12/x
  3. Step 3: Cross multiply
    1,172.24x = 1,618.72 × 779.12
  4. Step 4: Simplify right side
    1,172.24x = 1,261,177.13
  5. Step 5: Solve for x
    x = 1,261,177.13/1,172.24
  6. Step 6: Final answer
    x = 1,075.87

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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.