Home / 258,865.58-388,139.80-100,909.50

Finding the Fourth Proportional to 258,865.58, 388,139.80 and 100,909.50

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Solution

The fourth proportional to 258,865.58, 388,139.80 and 100,909.50 is: 151,302.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,865.58 : 388,139.80 = 100,909.50 : x
  2. Step 2: Convert to fraction form
    258,865.58/388,139.80 = 100,909.50/x
  3. Step 3: Cross multiply
    258,865.58x = 388,139.80 × 100,909.50
  4. Step 4: Simplify right side
    258,865.58x = 39,166,993,148.10
  5. Step 5: Solve for x
    x = 39,166,993,148.10/258,865.58
  6. Step 6: Final answer
    x = 151,302.44

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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.