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Finding the Fourth Proportional to 20,990.68, 28,964.19 and 11,559.86

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Solution

The fourth proportional to 20,990.68, 28,964.19 and 11,559.86 is: 15,950.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.68 : 28,964.19 = 11,559.86 : x
  2. Step 2: Convert to fraction form
    20,990.68/28,964.19 = 11,559.86/x
  3. Step 3: Cross multiply
    20,990.68x = 28,964.19 × 11,559.86
  4. Step 4: Simplify right side
    20,990.68x = 334,821,981.41
  5. Step 5: Solve for x
    x = 334,821,981.41/20,990.68
  6. Step 6: Final answer
    x = 15,950.98

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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.