Home / 21,720.48-29,972.58-12,289.68

Finding the Fourth Proportional to 21,720.48, 29,972.58 and 12,289.68

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Solution

The fourth proportional to 21,720.48, 29,972.58 and 12,289.68 is: 16,958.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,720.48 : 29,972.58 = 12,289.68 : x
  2. Step 2: Convert to fraction form
    21,720.48/29,972.58 = 12,289.68/x
  3. Step 3: Cross multiply
    21,720.48x = 29,972.58 × 12,289.68
  4. Step 4: Simplify right side
    21,720.48x = 368,353,416.97
  5. Step 5: Solve for x
    x = 368,353,416.97/21,720.48
  6. Step 6: Final answer
    x = 16,958.81

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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.