Home / 21,456.40-29,609.78-13,072.90

Finding the Fourth Proportional to 21,456.40, 29,609.78 and 13,072.90

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Solution

The fourth proportional to 21,456.40, 29,609.78 and 13,072.90 is: 18,040.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,456.40 : 29,609.78 = 13,072.90 : x
  2. Step 2: Convert to fraction form
    21,456.40/29,609.78 = 13,072.90/x
  3. Step 3: Cross multiply
    21,456.40x = 29,609.78 × 13,072.90
  4. Step 4: Simplify right side
    21,456.40x = 387,085,692.96
  5. Step 5: Solve for x
    x = 387,085,692.96/21,456.40
  6. Step 6: Final answer
    x = 18,040.57

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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.