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Finding the Fourth Proportional to 21,890.31, 30,209.00 and 12,459.75

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Solution

The fourth proportional to 21,890.31, 30,209.00 and 12,459.75 is: 17,194.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,890.31 : 30,209.00 = 12,459.75 : x
  2. Step 2: Convert to fraction form
    21,890.31/30,209.00 = 12,459.75/x
  3. Step 3: Cross multiply
    21,890.31x = 30,209.00 × 12,459.75
  4. Step 4: Simplify right side
    21,890.31x = 376,396,525.45
  5. Step 5: Solve for x
    x = 376,396,525.45/21,890.31
  6. Step 6: Final answer
    x = 17,194.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.