Home / 20,947.55-28,907.30-11,387.12

Finding the Fourth Proportional to 20,947.55, 28,907.30 and 11,387.12

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Solution

The fourth proportional to 20,947.55, 28,907.30 and 11,387.12 is: 15,714.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,947.55 : 28,907.30 = 11,387.12 : x
  2. Step 2: Convert to fraction form
    20,947.55/28,907.30 = 11,387.12/x
  3. Step 3: Cross multiply
    20,947.55x = 28,907.30 × 11,387.12
  4. Step 4: Simplify right side
    20,947.55x = 329,170,777.91
  5. Step 5: Solve for x
    x = 329,170,777.91/20,947.55
  6. Step 6: Final answer
    x = 15,714.05

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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.