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Finding the Fourth Proportional to 20,171.70, 30,185.55 and 12,779.70

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Solution

The fourth proportional to 20,171.70, 30,185.55 and 12,779.70 is: 19,123.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,171.70 : 30,185.55 = 12,779.70 : x
  2. Step 2: Convert to fraction form
    20,171.70/30,185.55 = 12,779.70/x
  3. Step 3: Cross multiply
    20,171.70x = 30,185.55 × 12,779.70
  4. Step 4: Simplify right side
    20,171.70x = 385,762,273.34
  5. Step 5: Solve for x
    x = 385,762,273.34/20,171.70
  6. Step 6: Final answer
    x = 19,123.93

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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.