Home / 21,850.11-30,148.34-12,891.51

Finding the Fourth Proportional to 21,850.11, 30,148.34 and 12,891.51

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Solution

The fourth proportional to 21,850.11, 30,148.34 and 12,891.51 is: 17,787.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,850.11 : 30,148.34 = 12,891.51 : x
  2. Step 2: Convert to fraction form
    21,850.11/30,148.34 = 12,891.51/x
  3. Step 3: Cross multiply
    21,850.11x = 30,148.34 × 12,891.51
  4. Step 4: Simplify right side
    21,850.11x = 388,657,562.14
  5. Step 5: Solve for x
    x = 388,657,562.14/21,850.11
  6. Step 6: Final answer
    x = 17,787.44

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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.