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Finding the Fourth Proportional to 15,805.32, 21,808.86 and 9,091.20

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Solution

The fourth proportional to 15,805.32, 21,808.86 and 9,091.20 is: 12,544.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,805.32 : 21,808.86 = 9,091.20 : x
  2. Step 2: Convert to fraction form
    15,805.32/21,808.86 = 9,091.20/x
  3. Step 3: Cross multiply
    15,805.32x = 21,808.86 × 9,091.20
  4. Step 4: Simplify right side
    15,805.32x = 198,268,708.03
  5. Step 5: Solve for x
    x = 198,268,708.03/15,805.32
  6. Step 6: Final answer
    x = 12,544.43

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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.