Home / 21,989.80-30,345.85-11,918.49

Finding the Fourth Proportional to 21,989.80, 30,345.85 and 11,918.49

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Solution

The fourth proportional to 21,989.80, 30,345.85 and 11,918.49 is: 16,447.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,989.80 : 30,345.85 = 11,918.49 : x
  2. Step 2: Convert to fraction form
    21,989.80/30,345.85 = 11,918.49/x
  3. Step 3: Cross multiply
    21,989.80x = 30,345.85 × 11,918.49
  4. Step 4: Simplify right side
    21,989.80x = 361,676,709.77
  5. Step 5: Solve for x
    x = 361,676,709.77/21,989.80
  6. Step 6: Final answer
    x = 16,447.48

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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.