Home / 21,891.12-30,209.64-11,955.12

Finding the Fourth Proportional to 21,891.12, 30,209.64 and 11,955.12

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Solution

The fourth proportional to 21,891.12, 30,209.64 and 11,955.12 is: 16,498.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,891.12 : 30,209.64 = 11,955.12 : x
  2. Step 2: Convert to fraction form
    21,891.12/30,209.64 = 11,955.12/x
  3. Step 3: Cross multiply
    21,891.12x = 30,209.64 × 11,955.12
  4. Step 4: Simplify right side
    21,891.12x = 361,159,871.36
  5. Step 5: Solve for x
    x = 361,159,871.36/21,891.12
  6. Step 6: Final answer
    x = 16,498.01

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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.