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Finding the Fourth Proportional to 15,765.21, 21,755.54 and 8,691.64

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Solution

The fourth proportional to 15,765.21, 21,755.54 and 8,691.64 is: 11,994.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,765.21 : 21,755.54 = 8,691.64 : x
  2. Step 2: Convert to fraction form
    15,765.21/21,755.54 = 8,691.64/x
  3. Step 3: Cross multiply
    15,765.21x = 21,755.54 × 8,691.64
  4. Step 4: Simplify right side
    15,765.21x = 189,091,289.03
  5. Step 5: Solve for x
    x = 189,091,289.03/15,765.21
  6. Step 6: Final answer
    x = 11,994.21

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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.