Home / 205,018.80-307,435.92-86,629.20

Finding the Fourth Proportional to 205,018.80, 307,435.92 and 86,629.20

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Solution

The fourth proportional to 205,018.80, 307,435.92 and 86,629.20 is: 129,904.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,018.80 : 307,435.92 = 86,629.20 : x
  2. Step 2: Convert to fraction form
    205,018.80/307,435.92 = 86,629.20/x
  3. Step 3: Cross multiply
    205,018.80x = 307,435.92 × 86,629.20
  4. Step 4: Simplify right side
    205,018.80x = 26,632,927,800.86
  5. Step 5: Solve for x
    x = 26,632,927,800.86/205,018.80
  6. Step 6: Final answer
    x = 129,904.81

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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.