Home / 20,123.78-30,190.76-11,810.75

Finding the Fourth Proportional to 20,123.78, 30,190.76 and 11,810.75

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Solution

The fourth proportional to 20,123.78, 30,190.76 and 11,810.75 is: 17,719.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,123.78 : 30,190.76 = 11,810.75 : x
  2. Step 2: Convert to fraction form
    20,123.78/30,190.76 = 11,810.75/x
  3. Step 3: Cross multiply
    20,123.78x = 30,190.76 × 11,810.75
  4. Step 4: Simplify right side
    20,123.78x = 356,575,518.67
  5. Step 5: Solve for x
    x = 356,575,518.67/20,123.78
  6. Step 6: Final answer
    x = 17,719.11

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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.