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Finding the Fourth Proportional to 1,192.69, 1,645.86 and 668.71

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Solution

The fourth proportional to 1,192.69, 1,645.86 and 668.71 is: 922.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,192.69 : 1,645.86 = 668.71 : x
  2. Step 2: Convert to fraction form
    1,192.69/1,645.86 = 668.71/x
  3. Step 3: Cross multiply
    1,192.69x = 1,645.86 × 668.71
  4. Step 4: Simplify right side
    1,192.69x = 1,100,603.04
  5. Step 5: Solve for x
    x = 1,100,603.04/1,192.69
  6. Step 6: Final answer
    x = 922.79

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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.