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Finding the Fourth Proportional to 15,884.66, 21,921.82 and 9,171.52

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Solution

The fourth proportional to 15,884.66, 21,921.82 and 9,171.52 is: 12,657.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,884.66 : 21,921.82 = 9,171.52 : x
  2. Step 2: Convert to fraction form
    15,884.66/21,921.82 = 9,171.52/x
  3. Step 3: Cross multiply
    15,884.66x = 21,921.82 × 9,171.52
  4. Step 4: Simplify right side
    15,884.66x = 201,056,410.57
  5. Step 5: Solve for x
    x = 201,056,410.57/15,884.66
  6. Step 6: Final answer
    x = 12,657.27

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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.