Home / 205,721.88-308,699.38-81,150.36

Finding the Fourth Proportional to 205,721.88, 308,699.38 and 81,150.36

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Solution

The fourth proportional to 205,721.88, 308,699.38 and 81,150.36 is: 121,771.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,721.88 : 308,699.38 = 81,150.36 : x
  2. Step 2: Convert to fraction form
    205,721.88/308,699.38 = 81,150.36/x
  3. Step 3: Cross multiply
    205,721.88x = 308,699.38 × 81,150.36
  4. Step 4: Simplify right side
    205,721.88x = 25,051,065,818.78
  5. Step 5: Solve for x
    x = 25,051,065,818.78/205,721.88
  6. Step 6: Final answer
    x = 121,771.52

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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.