Home / 20,021.20-30,031.80-12,658.30

Finding the Fourth Proportional to 20,021.20, 30,031.80 and 12,658.30

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Solution

The fourth proportional to 20,021.20, 30,031.80 and 12,658.30 is: 18,987.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,021.20 : 30,031.80 = 12,658.30 : x
  2. Step 2: Convert to fraction form
    20,021.20/30,031.80 = 12,658.30/x
  3. Step 3: Cross multiply
    20,021.20x = 30,031.80 × 12,658.30
  4. Step 4: Simplify right side
    20,021.20x = 380,151,533.94
  5. Step 5: Solve for x
    x = 380,151,533.94/20,021.20
  6. Step 6: Final answer
    x = 18,987.45

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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.