Home / 12,890.21-19,335.49-3,656.21

Finding the Fourth Proportional to 12,890.21, 19,335.49 and 3,656.21

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Solution

The fourth proportional to 12,890.21, 19,335.49 and 3,656.21 is: 5,484.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,890.21 : 19,335.49 = 3,656.21 : x
  2. Step 2: Convert to fraction form
    12,890.21/19,335.49 = 3,656.21/x
  3. Step 3: Cross multiply
    12,890.21x = 19,335.49 × 3,656.21
  4. Step 4: Simplify right side
    12,890.21x = 70,694,506.07
  5. Step 5: Solve for x
    x = 70,694,506.07/12,890.21
  6. Step 6: Final answer
    x = 5,484.36

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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.