Home / 15,783.22-21,761.49-12,788.02

Finding the Fourth Proportional to 15,783.22, 21,761.49 and 12,788.02

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Solution

The fourth proportional to 15,783.22, 21,761.49 and 12,788.02 is: 17,631.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,783.22 : 21,761.49 = 12,788.02 : x
  2. Step 2: Convert to fraction form
    15,783.22/21,761.49 = 12,788.02/x
  3. Step 3: Cross multiply
    15,783.22x = 21,761.49 × 12,788.02
  4. Step 4: Simplify right side
    15,783.22x = 278,286,369.35
  5. Step 5: Solve for x
    x = 278,286,369.35/15,783.22
  6. Step 6: Final answer
    x = 17,631.79

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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.