Home / 21,139.70-29,172.78-11,708.30

Finding the Fourth Proportional to 21,139.70, 29,172.78 and 11,708.30

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Solution

The fourth proportional to 21,139.70, 29,172.78 and 11,708.30 is: 16,157.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,139.70 : 29,172.78 = 11,708.30 : x
  2. Step 2: Convert to fraction form
    21,139.70/29,172.78 = 11,708.30/x
  3. Step 3: Cross multiply
    21,139.70x = 29,172.78 × 11,708.30
  4. Step 4: Simplify right side
    21,139.70x = 341,563,660.07
  5. Step 5: Solve for x
    x = 341,563,660.07/21,139.70
  6. Step 6: Final answer
    x = 16,157.45

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1.5x scale

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.