Home / 1,327,212.80-1,990,333.20-428,890.40

Finding the Fourth Proportional to 1,327,212.80, 1,990,333.20 and 428,890.40

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Solution

The fourth proportional to 1,327,212.80, 1,990,333.20 and 428,890.40 is: 643,178.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,327,212.80 : 1,990,333.20 = 428,890.40 : x
  2. Step 2: Convert to fraction form
    1,327,212.80/1,990,333.20 = 428,890.40/x
  3. Step 3: Cross multiply
    1,327,212.80x = 1,990,333.20 × 428,890.40
  4. Step 4: Simplify right side
    1,327,212.80x = 853,634,802,281.28
  5. Step 5: Solve for x
    x = 853,634,802,281.28/1,327,212.80
  6. Step 6: Final answer
    x = 643,178.55

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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.