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Finding the Fourth Proportional to 20,751.66, 28,637.19 and 11,320.14

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Solution

The fourth proportional to 20,751.66, 28,637.19 and 11,320.14 is: 15,621.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,751.66 : 28,637.19 = 11,320.14 : x
  2. Step 2: Convert to fraction form
    20,751.66/28,637.19 = 11,320.14/x
  3. Step 3: Cross multiply
    20,751.66x = 28,637.19 × 11,320.14
  4. Step 4: Simplify right side
    20,751.66x = 324,177,000.01
  5. Step 5: Solve for x
    x = 324,177,000.01/20,751.66
  6. Step 6: Final answer
    x = 15,621.74

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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.