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Finding the Fourth Proportional to 18,765.66, 28,129.86 and 10,449.48

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Solution

The fourth proportional to 18,765.66, 28,129.86 and 10,449.48 is: 15,663.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,765.66 : 28,129.86 = 10,449.48 : x
  2. Step 2: Convert to fraction form
    18,765.66/28,129.86 = 10,449.48/x
  3. Step 3: Cross multiply
    18,765.66x = 28,129.86 × 10,449.48
  4. Step 4: Simplify right side
    18,765.66x = 293,942,409.47
  5. Step 5: Solve for x
    x = 293,942,409.47/18,765.66
  6. Step 6: Final answer
    x = 15,663.85

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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.