Home / 1,389,961.78-1,918,132.58-778,119.56

Finding the Fourth Proportional to 1,389,961.78, 1,918,132.58 and 778,119.56

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Solution

The fourth proportional to 1,389,961.78, 1,918,132.58 and 778,119.56 is: 1,073,796.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389,961.78 : 1,918,132.58 = 778,119.56 : x
  2. Step 2: Convert to fraction form
    1,389,961.78/1,918,132.58 = 778,119.56/x
  3. Step 3: Cross multiply
    1,389,961.78x = 1,918,132.58 × 778,119.56
  4. Step 4: Simplify right side
    1,389,961.78x = 1,492,536,479,171.27
  5. Step 5: Solve for x
    x = 1,492,536,479,171.27/1,389,961.78
  6. Step 6: Final answer
    x = 1,073,796.78

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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.