Home / 21,139.59-29,172.57-11,708.15

Finding the Fourth Proportional to 21,139.59, 29,172.57 and 11,708.15

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Solution

The fourth proportional to 21,139.59, 29,172.57 and 11,708.15 is: 16,157.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,139.59 : 29,172.57 = 11,708.15 : x
  2. Step 2: Convert to fraction form
    21,139.59/29,172.57 = 11,708.15/x
  3. Step 3: Cross multiply
    21,139.59x = 29,172.57 × 11,708.15
  4. Step 4: Simplify right side
    21,139.59x = 341,556,825.45
  5. Step 5: Solve for x
    x = 341,556,825.45/21,139.59
  6. Step 6: Final answer
    x = 16,157.21

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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.