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Finding the Fourth Proportional to 20,280.70, 30,421.05 and 14,375.80

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Solution

The fourth proportional to 20,280.70, 30,421.05 and 14,375.80 is: 21,563.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,280.70 : 30,421.05 = 14,375.80 : x
  2. Step 2: Convert to fraction form
    20,280.70/30,421.05 = 14,375.80/x
  3. Step 3: Cross multiply
    20,280.70x = 30,421.05 × 14,375.80
  4. Step 4: Simplify right side
    20,280.70x = 437,326,930.59
  5. Step 5: Solve for x
    x = 437,326,930.59/20,280.70
  6. Step 6: Final answer
    x = 21,563.70

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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.