Home / 20,820.61-28,733.12-11,389.16

Finding the Fourth Proportional to 20,820.61, 28,733.12 and 11,389.16

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Solution

The fourth proportional to 20,820.61, 28,733.12 and 11,389.16 is: 15,717.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,820.61 : 28,733.12 = 11,389.16 : x
  2. Step 2: Convert to fraction form
    20,820.61/28,733.12 = 11,389.16/x
  3. Step 3: Cross multiply
    20,820.61x = 28,733.12 × 11,389.16
  4. Step 4: Simplify right side
    20,820.61x = 327,246,100.98
  5. Step 5: Solve for x
    x = 327,246,100.98/20,820.61
  6. Step 6: Final answer
    x = 15,717.41

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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.