Home / 20,915.76-28,836.36-15,251.88

Finding the Fourth Proportional to 20,915.76, 28,836.36 and 15,251.88

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Solution

The fourth proportional to 20,915.76, 28,836.36 and 15,251.88 is: 21,027.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,915.76 : 28,836.36 = 15,251.88 : x
  2. Step 2: Convert to fraction form
    20,915.76/28,836.36 = 15,251.88/x
  3. Step 3: Cross multiply
    20,915.76x = 28,836.36 × 15,251.88
  4. Step 4: Simplify right side
    20,915.76x = 439,808,702.36
  5. Step 5: Solve for x
    x = 439,808,702.36/20,915.76
  6. Step 6: Final answer
    x = 21,027.62

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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.