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Finding the Fourth Proportional to 20,756, 28,643.28 and 13,304

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Solution

The fourth proportional to 20,756, 28,643.28 and 13,304 is: 18,359.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,756 : 28,643.28 = 13,304 : x
  2. Step 2: Convert to fraction form
    20,756/28,643.28 = 13,304/x
  3. Step 3: Cross multiply
    20,756x = 28,643.28 × 13,304
  4. Step 4: Simplify right side
    20,756x = 381,070,197.12
  5. Step 5: Solve for x
    x = 381,070,197.12/20,756
  6. Step 6: Final answer
    x = 18,359.52

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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.