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Finding the Fourth Proportional to 578,440.80, 866,786.40 and 489,211.20

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Solution

The fourth proportional to 578,440.80, 866,786.40 and 489,211.20 is: 733,076.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    578,440.80 : 866,786.40 = 489,211.20 : x
  2. Step 2: Convert to fraction form
    578,440.80/866,786.40 = 489,211.20/x
  3. Step 3: Cross multiply
    578,440.80x = 866,786.40 × 489,211.20
  4. Step 4: Simplify right side
    578,440.80x = 424,041,614,887.68
  5. Step 5: Solve for x
    x = 424,041,614,887.68/578,440.80
  6. Step 6: Final answer
    x = 733,076.95

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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.