Home / 21,915.03-30,240.51-12,960.79

Finding the Fourth Proportional to 21,915.03, 30,240.51 and 12,960.79

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Solution

The fourth proportional to 21,915.03, 30,240.51 and 12,960.79 is: 17,884.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,915.03 : 30,240.51 = 12,960.79 : x
  2. Step 2: Convert to fraction form
    21,915.03/30,240.51 = 12,960.79/x
  3. Step 3: Cross multiply
    21,915.03x = 30,240.51 × 12,960.79
  4. Step 4: Simplify right side
    21,915.03x = 391,940,824.00
  5. Step 5: Solve for x
    x = 391,940,824.00/21,915.03
  6. Step 6: Final answer
    x = 17,884.57

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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.