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Finding the Fourth Proportional to 780,313.80, 1,170,640.80 and 443,515.80

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Solution

The fourth proportional to 780,313.80, 1,170,640.80 and 443,515.80 is: 665,370.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    780,313.80 : 1,170,640.80 = 443,515.80 : x
  2. Step 2: Convert to fraction form
    780,313.80/1,170,640.80 = 443,515.80/x
  3. Step 3: Cross multiply
    780,313.80x = 1,170,640.80 × 443,515.80
  4. Step 4: Simplify right side
    780,313.80x = 519,197,690,924.64
  5. Step 5: Solve for x
    x = 519,197,690,924.64/780,313.80
  6. Step 6: Final answer
    x = 665,370.38

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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.