Home / 20,123.15-30,180.45-7,638.80

Finding the Fourth Proportional to 20,123.15, 30,180.45 and 7,638.80

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Solution

The fourth proportional to 20,123.15, 30,180.45 and 7,638.80 is: 11,456.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,123.15 : 30,180.45 = 7,638.80 : x
  2. Step 2: Convert to fraction form
    20,123.15/30,180.45 = 7,638.80/x
  3. Step 3: Cross multiply
    20,123.15x = 30,180.45 × 7,638.80
  4. Step 4: Simplify right side
    20,123.15x = 230,542,421.46
  5. Step 5: Solve for x
    x = 230,542,421.46/20,123.15
  6. Step 6: Final answer
    x = 11,456.58

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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.