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Finding the Fourth Proportional to 19,305.95, 28,920.95 and 12,712.14

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Solution

The fourth proportional to 19,305.95, 28,920.95 and 12,712.14 is: 19,043.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,305.95 : 28,920.95 = 12,712.14 : x
  2. Step 2: Convert to fraction form
    19,305.95/28,920.95 = 12,712.14/x
  3. Step 3: Cross multiply
    19,305.95x = 28,920.95 × 12,712.14
  4. Step 4: Simplify right side
    19,305.95x = 367,647,149.44
  5. Step 5: Solve for x
    x = 367,647,149.44/19,305.95
  6. Step 6: Final answer
    x = 19,043.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.