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Finding the Fourth Proportional to 21,513.93, 29,680.93 and 15,862.09

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Solution

The fourth proportional to 21,513.93, 29,680.93 and 15,862.09 is: 21,883.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,513.93 : 29,680.93 = 15,862.09 : x
  2. Step 2: Convert to fraction form
    21,513.93/29,680.93 = 15,862.09/x
  3. Step 3: Cross multiply
    21,513.93x = 29,680.93 × 15,862.09
  4. Step 4: Simplify right side
    21,513.93x = 470,801,625.96
  5. Step 5: Solve for x
    x = 470,801,625.96/21,513.93
  6. Step 6: Final answer
    x = 21,883.57

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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.