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Finding the Fourth Proportional to 21,230.85, 31,845.12 and 8,750.64

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Solution

The fourth proportional to 21,230.85, 31,845.12 and 8,750.64 is: 13,125.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,230.85 : 31,845.12 = 8,750.64 : x
  2. Step 2: Convert to fraction form
    21,230.85/31,845.12 = 8,750.64/x
  3. Step 3: Cross multiply
    21,230.85x = 31,845.12 × 8,750.64
  4. Step 4: Simplify right side
    21,230.85x = 278,665,180.88
  5. Step 5: Solve for x
    x = 278,665,180.88/21,230.85
  6. Step 6: Final answer
    x = 13,125.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.