Home / 21,137.67-29,167.87-12,638.10

Finding the Fourth Proportional to 21,137.67, 29,167.87 and 12,638.10

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Solution

The fourth proportional to 21,137.67, 29,167.87 and 12,638.10 is: 17,439.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,137.67 : 29,167.87 = 12,638.10 : x
  2. Step 2: Convert to fraction form
    21,137.67/29,167.87 = 12,638.10/x
  3. Step 3: Cross multiply
    21,137.67x = 29,167.87 × 12,638.10
  4. Step 4: Simplify right side
    21,137.67x = 368,626,457.85
  5. Step 5: Solve for x
    x = 368,626,457.85/21,137.67
  6. Step 6: Final answer
    x = 17,439.31

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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.