Home / 21,780.30-32,587.83-12,900.39

Finding the Fourth Proportional to 21,780.30, 32,587.83 and 12,900.39

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Solution

The fourth proportional to 21,780.30, 32,587.83 and 12,900.39 is: 19,301.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,780.30 : 32,587.83 = 12,900.39 : x
  2. Step 2: Convert to fraction form
    21,780.30/32,587.83 = 12,900.39/x
  3. Step 3: Cross multiply
    21,780.30x = 32,587.83 × 12,900.39
  4. Step 4: Simplify right side
    21,780.30x = 420,395,716.25
  5. Step 5: Solve for x
    x = 420,395,716.25/21,780.30
  6. Step 6: Final answer
    x = 19,301.65

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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.