Home / 261,039.51-391,578.17-81,101.25

Finding the Fourth Proportional to 261,039.51, 391,578.17 and 81,101.25

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Solution

The fourth proportional to 261,039.51, 391,578.17 and 81,101.25 is: 121,657.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,039.51 : 391,578.17 = 81,101.25 : x
  2. Step 2: Convert to fraction form
    261,039.51/391,578.17 = 81,101.25/x
  3. Step 3: Cross multiply
    261,039.51x = 391,578.17 × 81,101.25
  4. Step 4: Simplify right side
    261,039.51x = 31,757,478,654.21
  5. Step 5: Solve for x
    x = 31,757,478,654.21/261,039.51
  6. Step 6: Final answer
    x = 121,657.75

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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.