Home / 21,420.14-29,559.78-11,988.70

Finding the Fourth Proportional to 21,420.14, 29,559.78 and 11,988.70

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Solution

The fourth proportional to 21,420.14, 29,559.78 and 11,988.70 is: 16,544.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,420.14 : 29,559.78 = 11,988.70 : x
  2. Step 2: Convert to fraction form
    21,420.14/29,559.78 = 11,988.70/x
  3. Step 3: Cross multiply
    21,420.14x = 29,559.78 × 11,988.70
  4. Step 4: Simplify right side
    21,420.14x = 354,383,260.59
  5. Step 5: Solve for x
    x = 354,383,260.59/21,420.14
  6. Step 6: Final answer
    x = 16,544.40

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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.