Home / 20,820.78-28,732.89-11,389.14

Finding the Fourth Proportional to 20,820.78, 28,732.89 and 11,389.14

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Solution

The fourth proportional to 20,820.78, 28,732.89 and 11,389.14 is: 15,717.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,820.78 : 28,732.89 = 11,389.14 : x
  2. Step 2: Convert to fraction form
    20,820.78/28,732.89 = 11,389.14/x
  3. Step 3: Cross multiply
    20,820.78x = 28,732.89 × 11,389.14
  4. Step 4: Simplify right side
    20,820.78x = 327,242,906.81
  5. Step 5: Solve for x
    x = 327,242,906.81/20,820.78
  6. Step 6: Final answer
    x = 15,717.13

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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.