Home / 828,109.80-1,242,164.70-428,872.95

Finding the Fourth Proportional to 828,109.80, 1,242,164.70 and 428,872.95

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Solution

The fourth proportional to 828,109.80, 1,242,164.70 and 428,872.95 is: 643,309.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    828,109.80 : 1,242,164.70 = 428,872.95 : x
  2. Step 2: Convert to fraction form
    828,109.80/1,242,164.70 = 428,872.95/x
  3. Step 3: Cross multiply
    828,109.80x = 1,242,164.70 × 428,872.95
  4. Step 4: Simplify right side
    828,109.80x = 532,730,839,274.87
  5. Step 5: Solve for x
    x = 532,730,839,274.87/828,109.80
  6. Step 6: Final answer
    x = 643,309.43

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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.