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Finding the Fourth Proportional to 20,387.70, 30,545.10 and 16,669.80

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Solution

The fourth proportional to 20,387.70, 30,545.10 and 16,669.80 is: 24,974.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,387.70 : 30,545.10 = 16,669.80 : x
  2. Step 2: Convert to fraction form
    20,387.70/30,545.10 = 16,669.80/x
  3. Step 3: Cross multiply
    20,387.70x = 30,545.10 × 16,669.80
  4. Step 4: Simplify right side
    20,387.70x = 509,180,707.98
  5. Step 5: Solve for x
    x = 509,180,707.98/20,387.70
  6. Step 6: Final answer
    x = 24,974.90

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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.