Home / 258,828.77-388,282.32-81,319.07

Finding the Fourth Proportional to 258,828.77, 388,282.32 and 81,319.07

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Solution

The fourth proportional to 258,828.77, 388,282.32 and 81,319.07 is: 121,990.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,828.77 : 388,282.32 = 81,319.07 : x
  2. Step 2: Convert to fraction form
    258,828.77/388,282.32 = 81,319.07/x
  3. Step 3: Cross multiply
    258,828.77x = 388,282.32 × 81,319.07
  4. Step 4: Simplify right side
    258,828.77x = 31,574,755,218.43
  5. Step 5: Solve for x
    x = 31,574,755,218.43/258,828.77
  6. Step 6: Final answer
    x = 121,990.90

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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.