Home / 21,139.20-29,172.80-11,708.64

Finding the Fourth Proportional to 21,139.20, 29,172.80 and 11,708.64

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Solution

The fourth proportional to 21,139.20, 29,172.80 and 11,708.64 is: 16,158.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,139.20 : 29,172.80 = 11,708.64 : x
  2. Step 2: Convert to fraction form
    21,139.20/29,172.80 = 11,708.64/x
  3. Step 3: Cross multiply
    21,139.20x = 29,172.80 × 11,708.64
  4. Step 4: Simplify right side
    21,139.20x = 341,573,812.99
  5. Step 5: Solve for x
    x = 341,573,812.99/21,139.20
  6. Step 6: Final answer
    x = 16,158.31

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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.