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Finding the Fourth Proportional to 15,805.65, 21,812.43 and 9,091.28

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Solution

The fourth proportional to 15,805.65, 21,812.43 and 9,091.28 is: 12,546.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,805.65 : 21,812.43 = 9,091.28 : x
  2. Step 2: Convert to fraction form
    15,805.65/21,812.43 = 9,091.28/x
  3. Step 3: Cross multiply
    15,805.65x = 21,812.43 × 9,091.28
  4. Step 4: Simplify right side
    15,805.65x = 198,302,799.55
  5. Step 5: Solve for x
    x = 198,302,799.55/15,805.65
  6. Step 6: Final answer
    x = 12,546.32

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Half scale
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Double scale
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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.