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Finding the Fourth Proportional to 20,891.01, 28,831.41 and 11,461.39

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Solution

The fourth proportional to 20,891.01, 28,831.41 and 11,461.39 is: 15,817.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,891.01 : 28,831.41 = 11,461.39 : x
  2. Step 2: Convert to fraction form
    20,891.01/28,831.41 = 11,461.39/x
  3. Step 3: Cross multiply
    20,891.01x = 28,831.41 × 11,461.39
  4. Step 4: Simplify right side
    20,891.01x = 330,447,976.95
  5. Step 5: Solve for x
    x = 330,447,976.95/20,891.01
  6. Step 6: Final answer
    x = 15,817.72

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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.