Home / 21,915.68-30,242.88-12,961.28

Finding the Fourth Proportional to 21,915.68, 30,242.88 and 12,961.28

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Solution

The fourth proportional to 21,915.68, 30,242.88 and 12,961.28 is: 17,886.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,915.68 : 30,242.88 = 12,961.28 : x
  2. Step 2: Convert to fraction form
    21,915.68/30,242.88 = 12,961.28/x
  3. Step 3: Cross multiply
    21,915.68x = 30,242.88 × 12,961.28
  4. Step 4: Simplify right side
    21,915.68x = 391,986,435.69
  5. Step 5: Solve for x
    x = 391,986,435.69/21,915.68
  6. Step 6: Final answer
    x = 17,886.12

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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.