Home / 21,120.88-29,145-11,687.08

Finding the Fourth Proportional to 21,120.88, 29,145 and 11,687.08

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Solution

The fourth proportional to 21,120.88, 29,145 and 11,687.08 is: 16,127.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,120.88 : 29,145 = 11,687.08 : x
  2. Step 2: Convert to fraction form
    21,120.88/29,145 = 11,687.08/x
  3. Step 3: Cross multiply
    21,120.88x = 29,145 × 11,687.08
  4. Step 4: Simplify right side
    21,120.88x = 340,619,946.60
  5. Step 5: Solve for x
    x = 340,619,946.60/21,120.88
  6. Step 6: Final answer
    x = 16,127.17

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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.