Home / 258,865.08-388,139.05-100,909

Finding the Fourth Proportional to 258,865.08, 388,139.05 and 100,909

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Solution

The fourth proportional to 258,865.08, 388,139.05 and 100,909 is: 151,301.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,865.08 : 388,139.05 = 100,909 : x
  2. Step 2: Convert to fraction form
    258,865.08/388,139.05 = 100,909/x
  3. Step 3: Cross multiply
    258,865.08x = 388,139.05 × 100,909
  4. Step 4: Simplify right side
    258,865.08x = 39,166,723,396.45
  5. Step 5: Solve for x
    x = 39,166,723,396.45/258,865.08
  6. Step 6: Final answer
    x = 151,301.69

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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.