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Finding the Fourth Proportional to 20,761.76, 28,652.76 and 11,812.14

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Solution

The fourth proportional to 20,761.76, 28,652.76 and 11,812.14 is: 16,301.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,761.76 : 28,652.76 = 11,812.14 : x
  2. Step 2: Convert to fraction form
    20,761.76/28,652.76 = 11,812.14/x
  3. Step 3: Cross multiply
    20,761.76x = 28,652.76 × 11,812.14
  4. Step 4: Simplify right side
    20,761.76x = 338,450,412.51
  5. Step 5: Solve for x
    x = 338,450,412.51/20,761.76
  6. Step 6: Final answer
    x = 16,301.63

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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.