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Finding the Fourth Proportional to 720,020.80, 1,078,994.40 and 320,334.40

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Solution

The fourth proportional to 720,020.80, 1,078,994.40 and 320,334.40 is: 480,040.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,020.80 : 1,078,994.40 = 320,334.40 : x
  2. Step 2: Convert to fraction form
    720,020.80/1,078,994.40 = 320,334.40/x
  3. Step 3: Cross multiply
    720,020.80x = 1,078,994.40 × 320,334.40
  4. Step 4: Simplify right side
    720,020.80x = 345,639,023,727.36
  5. Step 5: Solve for x
    x = 345,639,023,727.36/720,020.80
  6. Step 6: Final answer
    x = 480,040.33

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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.