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Finding the Fourth Proportional to 18,861.31, 28,291.97 and 5,010.31

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Solution

The fourth proportional to 18,861.31, 28,291.97 and 5,010.31 is: 7,515.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,861.31 : 28,291.97 = 5,010.31 : x
  2. Step 2: Convert to fraction form
    18,861.31/28,291.97 = 5,010.31/x
  3. Step 3: Cross multiply
    18,861.31x = 28,291.97 × 5,010.31
  4. Step 4: Simplify right side
    18,861.31x = 141,751,540.21
  5. Step 5: Solve for x
    x = 141,751,540.21/18,861.31
  6. Step 6: Final answer
    x = 7,515.47

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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.