Home / 21,862.89-30,169.56-12,908.34

Finding the Fourth Proportional to 21,862.89, 30,169.56 and 12,908.34

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Solution

The fourth proportional to 21,862.89, 30,169.56 and 12,908.34 is: 17,812.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,862.89 : 30,169.56 = 12,908.34 : x
  2. Step 2: Convert to fraction form
    21,862.89/30,169.56 = 12,908.34/x
  3. Step 3: Cross multiply
    21,862.89x = 30,169.56 × 12,908.34
  4. Step 4: Simplify right side
    21,862.89x = 389,438,938.13
  5. Step 5: Solve for x
    x = 389,438,938.13/21,862.89
  6. Step 6: Final answer
    x = 17,812.78

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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.