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Finding the Fourth Proportional to 20,903.70, 28,847.01 and 11,472.06

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Solution

The fourth proportional to 20,903.70, 28,847.01 and 11,472.06 is: 15,831.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,903.70 : 28,847.01 = 11,472.06 : x
  2. Step 2: Convert to fraction form
    20,903.70/28,847.01 = 11,472.06/x
  3. Step 3: Cross multiply
    20,903.70x = 28,847.01 × 11,472.06
  4. Step 4: Simplify right side
    20,903.70x = 330,934,629.54
  5. Step 5: Solve for x
    x = 330,934,629.54/20,903.70
  6. Step 6: Final answer
    x = 15,831.39

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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.