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Finding the Fourth Proportional to 489,169.20, 685,770 and 489,169.20

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Solution

The fourth proportional to 489,169.20, 685,770 and 489,169.20 is: 685,770

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,169.20 : 685,770 = 489,169.20 : x
  2. Step 2: Convert to fraction form
    489,169.20/685,770 = 489,169.20/x
  3. Step 3: Cross multiply
    489,169.20x = 685,770 × 489,169.20
  4. Step 4: Simplify right side
    489,169.20x = 335,457,562,284
  5. Step 5: Solve for x
    x = 335,457,562,284/489,169.20
  6. Step 6: Final answer
    x = 685,770

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.