Home / 81,130.94-121,696.50-21,159.38

Finding the Fourth Proportional to 81,130.94, 121,696.50 and 21,159.38

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Solution

The fourth proportional to 81,130.94, 121,696.50 and 21,159.38 is: 31,739.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,130.94 : 121,696.50 = 21,159.38 : x
  2. Step 2: Convert to fraction form
    81,130.94/121,696.50 = 21,159.38/x
  3. Step 3: Cross multiply
    81,130.94x = 121,696.50 × 21,159.38
  4. Step 4: Simplify right side
    81,130.94x = 2,575,021,879.69
  5. Step 5: Solve for x
    x = 2,575,021,879.69/81,130.94
  6. Step 6: Final answer
    x = 31,739.09

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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.