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Finding the Fourth Proportional to 20,959.88, 28,936.62 and 13,895.90

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Solution

The fourth proportional to 20,959.88, 28,936.62 and 13,895.90 is: 19,184.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,959.88 : 28,936.62 = 13,895.90 : x
  2. Step 2: Convert to fraction form
    20,959.88/28,936.62 = 13,895.90/x
  3. Step 3: Cross multiply
    20,959.88x = 28,936.62 × 13,895.90
  4. Step 4: Simplify right side
    20,959.88x = 402,100,377.86
  5. Step 5: Solve for x
    x = 402,100,377.86/20,959.88
  6. Step 6: Final answer
    x = 19,184.29

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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.