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Finding the Fourth Proportional to 20,990.67, 28,965.92 and 12,605.55

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Solution

The fourth proportional to 20,990.67, 28,965.92 and 12,605.55 is: 17,394.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.67 : 28,965.92 = 12,605.55 : x
  2. Step 2: Convert to fraction form
    20,990.67/28,965.92 = 12,605.55/x
  3. Step 3: Cross multiply
    20,990.67x = 28,965.92 × 12,605.55
  4. Step 4: Simplify right side
    20,990.67x = 365,131,289.83
  5. Step 5: Solve for x
    x = 365,131,289.83/20,990.67
  6. Step 6: Final answer
    x = 17,394.93

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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.