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Finding the Fourth Proportional to 20,415, 28,085.22 and 19,540.20

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Solution

The fourth proportional to 20,415, 28,085.22 and 19,540.20 is: 26,881.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,415 : 28,085.22 = 19,540.20 : x
  2. Step 2: Convert to fraction form
    20,415/28,085.22 = 19,540.20/x
  3. Step 3: Cross multiply
    20,415x = 28,085.22 × 19,540.20
  4. Step 4: Simplify right side
    20,415x = 548,790,815.84
  5. Step 5: Solve for x
    x = 548,790,815.84/20,415
  6. Step 6: Final answer
    x = 26,881.74

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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.