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Finding the Fourth Proportional to 20,730.88, 28,608 and 11,779.20

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Solution

The fourth proportional to 20,730.88, 28,608 and 11,779.20 is: 16,254.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,730.88 : 28,608 = 11,779.20 : x
  2. Step 2: Convert to fraction form
    20,730.88/28,608 = 11,779.20/x
  3. Step 3: Cross multiply
    20,730.88x = 28,608 × 11,779.20
  4. Step 4: Simplify right side
    20,730.88x = 336,979,353.60
  5. Step 5: Solve for x
    x = 336,979,353.60/20,730.88
  6. Step 6: Final answer
    x = 16,254.95

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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.