Home / 54,139.20-81,208.80-39,278.40

Finding the Fourth Proportional to 54,139.20, 81,208.80 and 39,278.40

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Solution

The fourth proportional to 54,139.20, 81,208.80 and 39,278.40 is: 58,917.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,139.20 : 81,208.80 = 39,278.40 : x
  2. Step 2: Convert to fraction form
    54,139.20/81,208.80 = 39,278.40/x
  3. Step 3: Cross multiply
    54,139.20x = 81,208.80 × 39,278.40
  4. Step 4: Simplify right side
    54,139.20x = 3,189,751,729.92
  5. Step 5: Solve for x
    x = 3,189,751,729.92/54,139.20
  6. Step 6: Final answer
    x = 58,917.60

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1.5x scale

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.