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Finding the Fourth Proportional to 815,843.40, 1,221,345.90 and 606,409.80

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Solution

The fourth proportional to 815,843.40, 1,221,345.90 and 606,409.80 is: 907,816.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    815,843.40 : 1,221,345.90 = 606,409.80 : x
  2. Step 2: Convert to fraction form
    815,843.40/1,221,345.90 = 606,409.80/x
  3. Step 3: Cross multiply
    815,843.40x = 1,221,345.90 × 606,409.80
  4. Step 4: Simplify right side
    815,843.40x = 740,636,122,949.82
  5. Step 5: Solve for x
    x = 740,636,122,949.82/815,843.40
  6. Step 6: Final answer
    x = 907,816.53

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.