Home / 20,820.15-28,732.20-11,389.32

Finding the Fourth Proportional to 20,820.15, 28,732.20 and 11,389.32

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Solution

The fourth proportional to 20,820.15, 28,732.20 and 11,389.32 is: 15,717.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,820.15 : 28,732.20 = 11,389.32 : x
  2. Step 2: Convert to fraction form
    20,820.15/28,732.20 = 11,389.32/x
  3. Step 3: Cross multiply
    20,820.15x = 28,732.20 × 11,389.32
  4. Step 4: Simplify right side
    20,820.15x = 327,240,220.10
  5. Step 5: Solve for x
    x = 327,240,220.10/20,820.15
  6. Step 6: Final answer
    x = 15,717.48

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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.