Home / 20,915.28-28,852.20-16,940.88

Finding the Fourth Proportional to 20,915.28, 28,852.20 and 16,940.88

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Solution

The fourth proportional to 20,915.28, 28,852.20 and 16,940.88 is: 23,369.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,915.28 : 28,852.20 = 16,940.88 : x
  2. Step 2: Convert to fraction form
    20,915.28/28,852.20 = 16,940.88/x
  3. Step 3: Cross multiply
    20,915.28x = 28,852.20 × 16,940.88
  4. Step 4: Simplify right side
    20,915.28x = 488,781,657.94
  5. Step 5: Solve for x
    x = 488,781,657.94/20,915.28
  6. Step 6: Final answer
    x = 23,369.60

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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.