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Finding the Fourth Proportional to 15,085.82, 20,819.73 and 8,372.76

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Solution

The fourth proportional to 15,085.82, 20,819.73 and 8,372.76 is: 11,555.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,085.82 : 20,819.73 = 8,372.76 : x
  2. Step 2: Convert to fraction form
    15,085.82/20,819.73 = 8,372.76/x
  3. Step 3: Cross multiply
    15,085.82x = 20,819.73 × 8,372.76
  4. Step 4: Simplify right side
    15,085.82x = 174,318,602.55
  5. Step 5: Solve for x
    x = 174,318,602.55/15,085.82
  6. Step 6: Final answer
    x = 11,555.13

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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.