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Finding the Fourth Proportional to 12,805.76, 19,209.95 and 3,445.85

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Solution

The fourth proportional to 12,805.76, 19,209.95 and 3,445.85 is: 5,169.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,805.76 : 19,209.95 = 3,445.85 : x
  2. Step 2: Convert to fraction form
    12,805.76/19,209.95 = 3,445.85/x
  3. Step 3: Cross multiply
    12,805.76x = 19,209.95 × 3,445.85
  4. Step 4: Simplify right side
    12,805.76x = 66,194,672.09
  5. Step 5: Solve for x
    x = 66,194,672.09/12,805.76
  6. Step 6: Final answer
    x = 5,169.13

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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.