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Finding the Fourth Proportional to 545,869.60, 819,418.80 and 421,760.80

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Solution

The fourth proportional to 545,869.60, 819,418.80 and 421,760.80 is: 633,115.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    545,869.60 : 819,418.80 = 421,760.80 : x
  2. Step 2: Convert to fraction form
    545,869.60/819,418.80 = 421,760.80/x
  3. Step 3: Cross multiply
    545,869.60x = 819,418.80 × 421,760.80
  4. Step 4: Simplify right side
    545,869.60x = 345,598,728,623.04
  5. Step 5: Solve for x
    x = 345,598,728,623.04/545,869.60
  6. Step 6: Final answer
    x = 633,115.91

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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.