Home / 21,857.56-30,161.88-12,904.60

Finding the Fourth Proportional to 21,857.56, 30,161.88 and 12,904.60

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Solution

The fourth proportional to 21,857.56, 30,161.88 and 12,904.60 is: 17,807.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,857.56 : 30,161.88 = 12,904.60 : x
  2. Step 2: Convert to fraction form
    21,857.56/30,161.88 = 12,904.60/x
  3. Step 3: Cross multiply
    21,857.56x = 30,161.88 × 12,904.60
  4. Step 4: Simplify right side
    21,857.56x = 389,226,996.65
  5. Step 5: Solve for x
    x = 389,226,996.65/21,857.56
  6. Step 6: Final answer
    x = 17,807.43

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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.