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Finding the Fourth Proportional to 1,208,928.72, 1,668,255.74 and 664,976.69

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Solution

The fourth proportional to 1,208,928.72, 1,668,255.74 and 664,976.69 is: 917,631.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208,928.72 : 1,668,255.74 = 664,976.69 : x
  2. Step 2: Convert to fraction form
    1,208,928.72/1,668,255.74 = 664,976.69/x
  3. Step 3: Cross multiply
    1,208,928.72x = 1,668,255.74 × 664,976.69
  4. Step 4: Simplify right side
    1,208,928.72x = 1,109,351,185,891.78
  5. Step 5: Solve for x
    x = 1,109,351,185,891.78/1,208,928.72
  6. Step 6: Final answer
    x = 917,631.59

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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.