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Finding the Fourth Proportional to 20,661.56, 28,513.06 and 11,230.13

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Solution

The fourth proportional to 20,661.56, 28,513.06 and 11,230.13 is: 15,497.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,661.56 : 28,513.06 = 11,230.13 : x
  2. Step 2: Convert to fraction form
    20,661.56/28,513.06 = 11,230.13/x
  3. Step 3: Cross multiply
    20,661.56x = 28,513.06 × 11,230.13
  4. Step 4: Simplify right side
    20,661.56x = 320,205,370.50
  5. Step 5: Solve for x
    x = 320,205,370.50/20,661.56
  6. Step 6: Final answer
    x = 15,497.64

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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.