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Finding the Fourth Proportional to 20,602.76, 30,860.30 and 11,815.88

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Solution

The fourth proportional to 20,602.76, 30,860.30 and 11,815.88 is: 17,698.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,602.76 : 30,860.30 = 11,815.88 : x
  2. Step 2: Convert to fraction form
    20,602.76/30,860.30 = 11,815.88/x
  3. Step 3: Cross multiply
    20,602.76x = 30,860.30 × 11,815.88
  4. Step 4: Simplify right side
    20,602.76x = 364,641,601.56
  5. Step 5: Solve for x
    x = 364,641,601.56/20,602.76
  6. Step 6: Final answer
    x = 17,698.68

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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.