Home / 21,220.68-29,284.74-11,789.40

Finding the Fourth Proportional to 21,220.68, 29,284.74 and 11,789.40

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Solution

The fourth proportional to 21,220.68, 29,284.74 and 11,789.40 is: 16,269.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,220.68 : 29,284.74 = 11,789.40 : x
  2. Step 2: Convert to fraction form
    21,220.68/29,284.74 = 11,789.40/x
  3. Step 3: Cross multiply
    21,220.68x = 29,284.74 × 11,789.40
  4. Step 4: Simplify right side
    21,220.68x = 345,249,513.76
  5. Step 5: Solve for x
    x = 345,249,513.76/21,220.68
  6. Step 6: Final answer
    x = 16,269.48

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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.