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Finding the Fourth Proportional to 12,861.52, 17,750.79 and 7,824.77

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Solution

The fourth proportional to 12,861.52, 17,750.79 and 7,824.77 is: 10,799.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,861.52 : 17,750.79 = 7,824.77 : x
  2. Step 2: Convert to fraction form
    12,861.52/17,750.79 = 7,824.77/x
  3. Step 3: Cross multiply
    12,861.52x = 17,750.79 × 7,824.77
  4. Step 4: Simplify right side
    12,861.52x = 138,895,849.07
  5. Step 5: Solve for x
    x = 138,895,849.07/12,861.52
  6. Step 6: Final answer
    x = 10,799.33

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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.