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Finding the Fourth Proportional to 485,440.40, 726,605.40 and 379,686.80

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Solution

The fourth proportional to 485,440.40, 726,605.40 and 379,686.80 is: 568,313.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,440.40 : 726,605.40 = 379,686.80 : x
  2. Step 2: Convert to fraction form
    485,440.40/726,605.40 = 379,686.80/x
  3. Step 3: Cross multiply
    485,440.40x = 726,605.40 × 379,686.80
  4. Step 4: Simplify right side
    485,440.40x = 275,882,479,188.72
  5. Step 5: Solve for x
    x = 275,882,479,188.72/485,440.40
  6. Step 6: Final answer
    x = 568,313.80

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1.5x scale

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.