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Finding the Fourth Proportional to 20,139.70, 30,173.10 and 16,421.80

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Solution

The fourth proportional to 20,139.70, 30,173.10 and 16,421.80 is: 24,602.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,139.70 : 30,173.10 = 16,421.80 : x
  2. Step 2: Convert to fraction form
    20,139.70/30,173.10 = 16,421.80/x
  3. Step 3: Cross multiply
    20,139.70x = 30,173.10 × 16,421.80
  4. Step 4: Simplify right side
    20,139.70x = 495,496,613.58
  5. Step 5: Solve for x
    x = 495,496,613.58/20,139.70
  6. Step 6: Final answer
    x = 24,602.98

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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.