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Finding the Fourth Proportional to 18,911.91, 28,372.08 and 5,765.31

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Solution

The fourth proportional to 18,911.91, 28,372.08 and 5,765.31 is: 8,649.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,911.91 : 28,372.08 = 5,765.31 : x
  2. Step 2: Convert to fraction form
    18,911.91/28,372.08 = 5,765.31/x
  3. Step 3: Cross multiply
    18,911.91x = 28,372.08 × 5,765.31
  4. Step 4: Simplify right side
    18,911.91x = 163,573,836.54
  5. Step 5: Solve for x
    x = 163,573,836.54/18,911.91
  6. Step 6: Final answer
    x = 8,649.25

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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.