Home / 21,915.28-30,240.84-12,961.03

Finding the Fourth Proportional to 21,915.28, 30,240.84 and 12,961.03

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Solution

The fourth proportional to 21,915.28, 30,240.84 and 12,961.03 is: 17,884.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,915.28 : 30,240.84 = 12,961.03 : x
  2. Step 2: Convert to fraction form
    21,915.28/30,240.84 = 12,961.03/x
  3. Step 3: Cross multiply
    21,915.28x = 30,240.84 × 12,961.03
  4. Step 4: Simplify right side
    21,915.28x = 391,952,434.47
  5. Step 5: Solve for x
    x = 391,952,434.47/21,915.28
  6. Step 6: Final answer
    x = 17,884.89

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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.