Home / 21,720.42-29,974.68-12,289.50

Finding the Fourth Proportional to 21,720.42, 29,974.68 and 12,289.50

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Solution

The fourth proportional to 21,720.42, 29,974.68 and 12,289.50 is: 16,959.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,720.42 : 29,974.68 = 12,289.50 : x
  2. Step 2: Convert to fraction form
    21,720.42/29,974.68 = 12,289.50/x
  3. Step 3: Cross multiply
    21,720.42x = 29,974.68 × 12,289.50
  4. Step 4: Simplify right side
    21,720.42x = 368,373,829.86
  5. Step 5: Solve for x
    x = 368,373,829.86/21,720.42
  6. Step 6: Final answer
    x = 16,959.79

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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.