Home / 258,999.25-387,768.45-137,143.66

Finding the Fourth Proportional to 258,999.25, 387,768.45 and 137,143.66

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Solution

The fourth proportional to 258,999.25, 387,768.45 and 137,143.66 is: 205,328.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,999.25 : 387,768.45 = 137,143.66 : x
  2. Step 2: Convert to fraction form
    258,999.25/387,768.45 = 137,143.66/x
  3. Step 3: Cross multiply
    258,999.25x = 387,768.45 × 137,143.66
  4. Step 4: Simplify right side
    258,999.25x = 53,179,984,465.53
  5. Step 5: Solve for x
    x = 53,179,984,465.53/258,999.25
  6. Step 6: Final answer
    x = 205,328.72

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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.