Home / 21,513.09-29,679.75-15,861.25

Finding the Fourth Proportional to 21,513.09, 29,679.75 and 15,861.25

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Solution

The fourth proportional to 21,513.09, 29,679.75 and 15,861.25 is: 21,882.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,513.09 : 29,679.75 = 15,861.25 : x
  2. Step 2: Convert to fraction form
    21,513.09/29,679.75 = 15,861.25/x
  3. Step 3: Cross multiply
    21,513.09x = 29,679.75 × 15,861.25
  4. Step 4: Simplify right side
    21,513.09x = 470,757,971.79
  5. Step 5: Solve for x
    x = 470,757,971.79/21,513.09
  6. Step 6: Final answer
    x = 21,882.39

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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.