Home / 21,720.92-29,975.52-12,289.28

Finding the Fourth Proportional to 21,720.92, 29,975.52 and 12,289.28

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Solution

The fourth proportional to 21,720.92, 29,975.52 and 12,289.28 is: 16,959.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,720.92 : 29,975.52 = 12,289.28 : x
  2. Step 2: Convert to fraction form
    21,720.92/29,975.52 = 12,289.28/x
  3. Step 3: Cross multiply
    21,720.92x = 29,975.52 × 12,289.28
  4. Step 4: Simplify right side
    21,720.92x = 368,377,558.43
  5. Step 5: Solve for x
    x = 368,377,558.43/21,720.92
  6. Step 6: Final answer
    x = 16,959.57

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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.