Home / 21,915.89-32,866.35-7,121.15

Finding the Fourth Proportional to 21,915.89, 32,866.35 and 7,121.15

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Solution

The fourth proportional to 21,915.89, 32,866.35 and 7,121.15 is: 10,679.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,915.89 : 32,866.35 = 7,121.15 : x
  2. Step 2: Convert to fraction form
    21,915.89/32,866.35 = 7,121.15/x
  3. Step 3: Cross multiply
    21,915.89x = 32,866.35 × 7,121.15
  4. Step 4: Simplify right side
    21,915.89x = 234,046,043.97
  5. Step 5: Solve for x
    x = 234,046,043.97/21,915.89
  6. Step 6: Final answer
    x = 10,679.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.