Home / 21,189.90-31,786.07-6,400.31

Finding the Fourth Proportional to 21,189.90, 31,786.07 and 6,400.31

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Solution

The fourth proportional to 21,189.90, 31,786.07 and 6,400.31 is: 9,600.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,189.90 : 31,786.07 = 6,400.31 : x
  2. Step 2: Convert to fraction form
    21,189.90/31,786.07 = 6,400.31/x
  3. Step 3: Cross multiply
    21,189.90x = 31,786.07 × 6,400.31
  4. Step 4: Simplify right side
    21,189.90x = 203,440,749.15
  5. Step 5: Solve for x
    x = 203,440,749.15/21,189.90
  6. Step 6: Final answer
    x = 9,600.84

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1.5x scale

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.