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Finding the Fourth Proportional to 1,172.60, 1,618.14 and 779.35

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Solution

The fourth proportional to 1,172.60, 1,618.14 and 779.35 is: 1,075.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.60 : 1,618.14 = 779.35 : x
  2. Step 2: Convert to fraction form
    1,172.60/1,618.14 = 779.35/x
  3. Step 3: Cross multiply
    1,172.60x = 1,618.14 × 779.35
  4. Step 4: Simplify right side
    1,172.60x = 1,261,097.41
  5. Step 5: Solve for x
    x = 1,261,097.41/1,172.60
  6. Step 6: Final answer
    x = 1,075.47

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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.