Home / 258,428.50-387,642.77-80,949.35

Finding the Fourth Proportional to 258,428.50, 387,642.77 and 80,949.35

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Solution

The fourth proportional to 258,428.50, 387,642.77 and 80,949.35 is: 121,424.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,428.50 : 387,642.77 = 80,949.35 : x
  2. Step 2: Convert to fraction form
    258,428.50/387,642.77 = 80,949.35/x
  3. Step 3: Cross multiply
    258,428.50x = 387,642.77 × 80,949.35
  4. Step 4: Simplify right side
    258,428.50x = 31,379,429,858.95
  5. Step 5: Solve for x
    x = 31,379,429,858.95/258,428.50
  6. Step 6: Final answer
    x = 121,424.03

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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.