Home / 21,137.40-31,714.20-20,805.30

Finding the Fourth Proportional to 21,137.40, 31,714.20 and 20,805.30

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Solution

The fourth proportional to 21,137.40, 31,714.20 and 20,805.30 is: 31,215.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,137.40 : 31,714.20 = 20,805.30 : x
  2. Step 2: Convert to fraction form
    21,137.40/31,714.20 = 20,805.30/x
  3. Step 3: Cross multiply
    21,137.40x = 31,714.20 × 20,805.30
  4. Step 4: Simplify right side
    21,137.40x = 659,823,445.26
  5. Step 5: Solve for x
    x = 659,823,445.26/21,137.40
  6. Step 6: Final answer
    x = 31,215.92

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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.