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Finding the Fourth Proportional to 12,890.63, 19,335.95 and 3,656.63

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Solution

The fourth proportional to 12,890.63, 19,335.95 and 3,656.63 is: 5,484.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,890.63 : 19,335.95 = 3,656.63 : x
  2. Step 2: Convert to fraction form
    12,890.63/19,335.95 = 3,656.63/x
  3. Step 3: Cross multiply
    12,890.63x = 19,335.95 × 3,656.63
  4. Step 4: Simplify right side
    12,890.63x = 70,704,299.89
  5. Step 5: Solve for x
    x = 70,704,299.89/12,890.63
  6. Step 6: Final answer
    x = 5,484.94

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Similar ratio
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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.