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Finding the Fourth Proportional to 20,506.50, 28,290.87 and 12,950.01

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Solution

The fourth proportional to 20,506.50, 28,290.87 and 12,950.01 is: 17,865.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,506.50 : 28,290.87 = 12,950.01 : x
  2. Step 2: Convert to fraction form
    20,506.50/28,290.87 = 12,950.01/x
  3. Step 3: Cross multiply
    20,506.50x = 28,290.87 × 12,950.01
  4. Step 4: Simplify right side
    20,506.50x = 366,367,049.41
  5. Step 5: Solve for x
    x = 366,367,049.41/20,506.50
  6. Step 6: Final answer
    x = 17,865.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.