Home / 21,915.36-30,251.07-12,970.53

Finding the Fourth Proportional to 21,915.36, 30,251.07 and 12,970.53

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Solution

The fourth proportional to 21,915.36, 30,251.07 and 12,970.53 is: 17,903.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,915.36 : 30,251.07 = 12,970.53 : x
  2. Step 2: Convert to fraction form
    21,915.36/30,251.07 = 12,970.53/x
  3. Step 3: Cross multiply
    21,915.36x = 30,251.07 × 12,970.53
  4. Step 4: Simplify right side
    21,915.36x = 392,372,410.97
  5. Step 5: Solve for x
    x = 392,372,410.97/21,915.36
  6. Step 6: Final answer
    x = 17,903.99

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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.