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Finding the Fourth Proportional to 20,519.80, 30,779.70 and 15,335.80

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Solution

The fourth proportional to 20,519.80, 30,779.70 and 15,335.80 is: 23,003.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,519.80 : 30,779.70 = 15,335.80 : x
  2. Step 2: Convert to fraction form
    20,519.80/30,779.70 = 15,335.80/x
  3. Step 3: Cross multiply
    20,519.80x = 30,779.70 × 15,335.80
  4. Step 4: Simplify right side
    20,519.80x = 472,031,323.26
  5. Step 5: Solve for x
    x = 472,031,323.26/20,519.80
  6. Step 6: Final answer
    x = 23,003.70

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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.