Home / 21,120.36-29,136.96-12,732

Finding the Fourth Proportional to 21,120.36, 29,136.96 and 12,732

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Solution

The fourth proportional to 21,120.36, 29,136.96 and 12,732 is: 17,564.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,120.36 : 29,136.96 = 12,732 : x
  2. Step 2: Convert to fraction form
    21,120.36/29,136.96 = 12,732/x
  3. Step 3: Cross multiply
    21,120.36x = 29,136.96 × 12,732
  4. Step 4: Simplify right side
    21,120.36x = 370,971,774.72
  5. Step 5: Solve for x
    x = 370,971,774.72/21,120.36
  6. Step 6: Final answer
    x = 17,564.65

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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.