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Finding the Fourth Proportional to 870,991.62, 1,201,959.45 and 489,009.54

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Solution

The fourth proportional to 870,991.62, 1,201,959.45 and 489,009.54 is: 674,828.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    870,991.62 : 1,201,959.45 = 489,009.54 : x
  2. Step 2: Convert to fraction form
    870,991.62/1,201,959.45 = 489,009.54/x
  3. Step 3: Cross multiply
    870,991.62x = 1,201,959.45 × 489,009.54
  4. Step 4: Simplify right side
    870,991.62x = 587,769,637,743.15
  5. Step 5: Solve for x
    x = 587,769,637,743.15/870,991.62
  6. Step 6: Final answer
    x = 674,828.12

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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.