Home / 21,138.76-29,172-11,708.02

Finding the Fourth Proportional to 21,138.76, 29,172 and 11,708.02

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Solution

The fourth proportional to 21,138.76, 29,172 and 11,708.02 is: 16,157.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,138.76 : 29,172 = 11,708.02 : x
  2. Step 2: Convert to fraction form
    21,138.76/29,172 = 11,708.02/x
  3. Step 3: Cross multiply
    21,138.76x = 29,172 × 11,708.02
  4. Step 4: Simplify right side
    21,138.76x = 341,546,359.44
  5. Step 5: Solve for x
    x = 341,546,359.44/21,138.76
  6. Step 6: Final answer
    x = 16,157.35

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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.