Home / 258,905.80-388,358.70-71,917.30

Finding the Fourth Proportional to 258,905.80, 388,358.70 and 71,917.30

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Solution

The fourth proportional to 258,905.80, 388,358.70 and 71,917.30 is: 107,875.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,905.80 : 388,358.70 = 71,917.30 : x
  2. Step 2: Convert to fraction form
    258,905.80/388,358.70 = 71,917.30/x
  3. Step 3: Cross multiply
    258,905.80x = 388,358.70 × 71,917.30
  4. Step 4: Simplify right side
    258,905.80x = 27,929,709,135.51
  5. Step 5: Solve for x
    x = 27,929,709,135.51/258,905.80
  6. Step 6: Final answer
    x = 107,875.95

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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.