Home / 21,177.36-31,609.20-18,686.64

Finding the Fourth Proportional to 21,177.36, 31,609.20 and 18,686.64

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Solution

The fourth proportional to 21,177.36, 31,609.20 and 18,686.64 is: 27,891.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,177.36 : 31,609.20 = 18,686.64 : x
  2. Step 2: Convert to fraction form
    21,177.36/31,609.20 = 18,686.64/x
  3. Step 3: Cross multiply
    21,177.36x = 31,609.20 × 18,686.64
  4. Step 4: Simplify right side
    21,177.36x = 590,669,741.09
  5. Step 5: Solve for x
    x = 590,669,741.09/21,177.36
  6. Step 6: Final answer
    x = 27,891.57

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.