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Finding the Fourth Proportional to 20,990.76, 28,967.11 and 11,559.25

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Solution

The fourth proportional to 20,990.76, 28,967.11 and 11,559.25 is: 15,951.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.76 : 28,967.11 = 11,559.25 : x
  2. Step 2: Convert to fraction form
    20,990.76/28,967.11 = 11,559.25/x
  3. Step 3: Cross multiply
    20,990.76x = 28,967.11 × 11,559.25
  4. Step 4: Simplify right side
    20,990.76x = 334,838,066.27
  5. Step 5: Solve for x
    x = 334,838,066.27/20,990.76
  6. Step 6: Final answer
    x = 15,951.69

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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.