Home / 258,425.18-387,639.39-80,918.54

Finding the Fourth Proportional to 258,425.18, 387,639.39 and 80,918.54

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Solution

The fourth proportional to 258,425.18, 387,639.39 and 80,918.54 is: 121,378.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,425.18 : 387,639.39 = 80,918.54 : x
  2. Step 2: Convert to fraction form
    258,425.18/387,639.39 = 80,918.54/x
  3. Step 3: Cross multiply
    258,425.18x = 387,639.39 × 80,918.54
  4. Step 4: Simplify right side
    258,425.18x = 31,367,213,485.29
  5. Step 5: Solve for x
    x = 31,367,213,485.29/258,425.18
  6. Step 6: Final answer
    x = 121,378.32

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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.