Home / 1,320,138.78-1,821,728.51-810,742.74

Finding the Fourth Proportional to 1,320,138.78, 1,821,728.51 and 810,742.74

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Solution

The fourth proportional to 1,320,138.78, 1,821,728.51 and 810,742.74 is: 1,118,786.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320,138.78 : 1,821,728.51 = 810,742.74 : x
  2. Step 2: Convert to fraction form
    1,320,138.78/1,821,728.51 = 810,742.74/x
  3. Step 3: Cross multiply
    1,320,138.78x = 1,821,728.51 × 810,742.74
  4. Step 4: Simplify right side
    1,320,138.78x = 1,476,953,155,888.61
  5. Step 5: Solve for x
    x = 1,476,953,155,888.61/1,320,138.78
  6. Step 6: Final answer
    x = 1,118,786.28

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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.