Home / 21,138.66-31,757.37-18,186.30

Finding the Fourth Proportional to 21,138.66, 31,757.37 and 18,186.30

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Solution

The fourth proportional to 21,138.66, 31,757.37 and 18,186.30 is: 27,321.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,138.66 : 31,757.37 = 18,186.30 : x
  2. Step 2: Convert to fraction form
    21,138.66/31,757.37 = 18,186.30/x
  3. Step 3: Cross multiply
    21,138.66x = 31,757.37 × 18,186.30
  4. Step 4: Simplify right side
    21,138.66x = 577,549,058.03
  5. Step 5: Solve for x
    x = 577,549,058.03/21,138.66
  6. Step 6: Final answer
    x = 27,321.93

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.