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Finding the Fourth Proportional to 1,172.69, 1,618.26 and 668.61

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Solution

The fourth proportional to 1,172.69, 1,618.26 and 668.61 is: 922.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.69 : 1,618.26 = 668.61 : x
  2. Step 2: Convert to fraction form
    1,172.69/1,618.26 = 668.61/x
  3. Step 3: Cross multiply
    1,172.69x = 1,618.26 × 668.61
  4. Step 4: Simplify right side
    1,172.69x = 1,081,984.82
  5. Step 5: Solve for x
    x = 1,081,984.82/1,172.69
  6. Step 6: Final answer
    x = 922.66

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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.