Home / 81,291.74-121,945.86-30,678.08

Finding the Fourth Proportional to 81,291.74, 121,945.86 and 30,678.08

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Solution

The fourth proportional to 81,291.74, 121,945.86 and 30,678.08 is: 46,020.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,291.74 : 121,945.86 = 30,678.08 : x
  2. Step 2: Convert to fraction form
    81,291.74/121,945.86 = 30,678.08/x
  3. Step 3: Cross multiply
    81,291.74x = 121,945.86 × 30,678.08
  4. Step 4: Simplify right side
    81,291.74x = 3,741,064,239.02
  5. Step 5: Solve for x
    x = 3,741,064,239.02/81,291.74
  6. Step 6: Final answer
    x = 46,020.23

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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.