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Finding the Fourth Proportional to 21,681.01, 29,929.02 and 13,185.87

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Solution

The fourth proportional to 21,681.01, 29,929.02 and 13,185.87 is: 18,202.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,681.01 : 29,929.02 = 13,185.87 : x
  2. Step 2: Convert to fraction form
    21,681.01/29,929.02 = 13,185.87/x
  3. Step 3: Cross multiply
    21,681.01x = 29,929.02 × 13,185.87
  4. Step 4: Simplify right side
    21,681.01x = 394,640,017.30
  5. Step 5: Solve for x
    x = 394,640,017.30/21,681.01
  6. Step 6: Final answer
    x = 18,202.10

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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.