Home / 21,189.75-31,784.86-6,398.80

Finding the Fourth Proportional to 21,189.75, 31,784.86 and 6,398.80

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Solution

The fourth proportional to 21,189.75, 31,784.86 and 6,398.80 is: 9,598.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,189.75 : 31,784.86 = 6,398.80 : x
  2. Step 2: Convert to fraction form
    21,189.75/31,784.86 = 6,398.80/x
  3. Step 3: Cross multiply
    21,189.75x = 31,784.86 × 6,398.80
  4. Step 4: Simplify right side
    21,189.75x = 203,384,854.71
  5. Step 5: Solve for x
    x = 203,384,854.71/21,189.75
  6. Step 6: Final answer
    x = 9,598.27

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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.