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Finding the Fourth Proportional to 15,381, 21,220.92 and 9,409.68

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Solution

The fourth proportional to 15,381, 21,220.92 and 9,409.68 is: 12,982.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,381 : 21,220.92 = 9,409.68 : x
  2. Step 2: Convert to fraction form
    15,381/21,220.92 = 9,409.68/x
  3. Step 3: Cross multiply
    15,381x = 21,220.92 × 9,409.68
  4. Step 4: Simplify right side
    15,381x = 199,682,066.51
  5. Step 5: Solve for x
    x = 199,682,066.51/15,381
  6. Step 6: Final answer
    x = 12,982.39

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Double scale
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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.