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Finding the Fourth Proportional to 14,805.15, 20,431.20 and 8,090.88

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Solution

The fourth proportional to 14,805.15, 20,431.20 and 8,090.88 is: 11,165.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,805.15 : 20,431.20 = 8,090.88 : x
  2. Step 2: Convert to fraction form
    14,805.15/20,431.20 = 8,090.88/x
  3. Step 3: Cross multiply
    14,805.15x = 20,431.20 × 8,090.88
  4. Step 4: Simplify right side
    14,805.15x = 165,306,387.46
  5. Step 5: Solve for x
    x = 165,306,387.46/14,805.15
  6. Step 6: Final answer
    x = 11,165.47

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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.