Home / 21,689.10-29,932.51-13,189.64

Finding the Fourth Proportional to 21,689.10, 29,932.51 and 13,189.64

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Solution

The fourth proportional to 21,689.10, 29,932.51 and 13,189.64 is: 18,202.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,689.10 : 29,932.51 = 13,189.64 : x
  2. Step 2: Convert to fraction form
    21,689.10/29,932.51 = 13,189.64/x
  3. Step 3: Cross multiply
    21,689.10x = 29,932.51 × 13,189.64
  4. Step 4: Simplify right side
    21,689.10x = 394,799,031.20
  5. Step 5: Solve for x
    x = 394,799,031.20/21,689.10
  6. Step 6: Final answer
    x = 18,202.65

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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.