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Finding the Fourth Proportional to 20,657.42, 30,985.04 and 12,113.61

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Solution

The fourth proportional to 20,657.42, 30,985.04 and 12,113.61 is: 18,169.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,657.42 : 30,985.04 = 12,113.61 : x
  2. Step 2: Convert to fraction form
    20,657.42/30,985.04 = 12,113.61/x
  3. Step 3: Cross multiply
    20,657.42x = 30,985.04 × 12,113.61
  4. Step 4: Simplify right side
    20,657.42x = 375,340,629.83
  5. Step 5: Solve for x
    x = 375,340,629.83/20,657.42
  6. Step 6: Final answer
    x = 18,169.78

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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.