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Finding the Fourth Proportional to 20,814.68, 28,721.04 and 12,198.08

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Solution

The fourth proportional to 20,814.68, 28,721.04 and 12,198.08 is: 16,831.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,814.68 : 28,721.04 = 12,198.08 : x
  2. Step 2: Convert to fraction form
    20,814.68/28,721.04 = 12,198.08/x
  3. Step 3: Cross multiply
    20,814.68x = 28,721.04 × 12,198.08
  4. Step 4: Simplify right side
    20,814.68x = 350,341,543.60
  5. Step 5: Solve for x
    x = 350,341,543.60/20,814.68
  6. Step 6: Final answer
    x = 16,831.46

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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.