Home / 21,120-29,143.08-11,687.28

Finding the Fourth Proportional to 21,120, 29,143.08 and 11,687.28

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Solution

The fourth proportional to 21,120, 29,143.08 and 11,687.28 is: 16,127.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,120 : 29,143.08 = 11,687.28 : x
  2. Step 2: Convert to fraction form
    21,120/29,143.08 = 11,687.28/x
  3. Step 3: Cross multiply
    21,120x = 29,143.08 × 11,687.28
  4. Step 4: Simplify right side
    21,120x = 340,603,336.02
  5. Step 5: Solve for x
    x = 340,603,336.02/21,120
  6. Step 6: Final answer
    x = 16,127.05

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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.