Home / 21,153.92-29,190-11,720.08

Finding the Fourth Proportional to 21,153.92, 29,190 and 11,720.08

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Solution

The fourth proportional to 21,153.92, 29,190 and 11,720.08 is: 16,172.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,153.92 : 29,190 = 11,720.08 : x
  2. Step 2: Convert to fraction form
    21,153.92/29,190 = 11,720.08/x
  3. Step 3: Cross multiply
    21,153.92x = 29,190 × 11,720.08
  4. Step 4: Simplify right side
    21,153.92x = 342,109,135.20
  5. Step 5: Solve for x
    x = 342,109,135.20/21,153.92
  6. Step 6: Final answer
    x = 16,172.38

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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.