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Finding the Fourth Proportional to 15,090.78, 20,827.44 and 8,716.11

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Solution

The fourth proportional to 15,090.78, 20,827.44 and 8,716.11 is: 12,029.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,090.78 : 20,827.44 = 8,716.11 : x
  2. Step 2: Convert to fraction form
    15,090.78/20,827.44 = 8,716.11/x
  3. Step 3: Cross multiply
    15,090.78x = 20,827.44 × 8,716.11
  4. Step 4: Simplify right side
    15,090.78x = 181,534,258.06
  5. Step 5: Solve for x
    x = 181,534,258.06/15,090.78
  6. Step 6: Final answer
    x = 12,029.48

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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.