Home / 1,390,729.60-1,919,249.20-778,880.80

Finding the Fourth Proportional to 1,390,729.60, 1,919,249.20 and 778,880.80

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Solution

The fourth proportional to 1,390,729.60, 1,919,249.20 and 778,880.80 is: 1,074,879.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390,729.60 : 1,919,249.20 = 778,880.80 : x
  2. Step 2: Convert to fraction form
    1,390,729.60/1,919,249.20 = 778,880.80/x
  3. Step 3: Cross multiply
    1,390,729.60x = 1,919,249.20 × 778,880.80
  4. Step 4: Simplify right side
    1,390,729.60x = 1,494,866,352,295.36
  5. Step 5: Solve for x
    x = 1,494,866,352,295.36/1,390,729.60
  6. Step 6: Final answer
    x = 1,074,879.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.