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Finding the Fourth Proportional to 20,617, 28,451.19 and 11,185.90

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Solution

The fourth proportional to 20,617, 28,451.19 and 11,185.90 is: 15,436.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,617 : 28,451.19 = 11,185.90 : x
  2. Step 2: Convert to fraction form
    20,617/28,451.19 = 11,185.90/x
  3. Step 3: Cross multiply
    20,617x = 28,451.19 × 11,185.90
  4. Step 4: Simplify right side
    20,617x = 318,252,166.22
  5. Step 5: Solve for x
    x = 318,252,166.22/20,617
  6. Step 6: Final answer
    x = 15,436.40

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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.