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Finding the Fourth Proportional to 18,971.55, 28,457.33 and 9,108.45

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Solution

The fourth proportional to 18,971.55, 28,457.33 and 9,108.45 is: 13,662.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,971.55 : 28,457.33 = 9,108.45 : x
  2. Step 2: Convert to fraction form
    18,971.55/28,457.33 = 9,108.45/x
  3. Step 3: Cross multiply
    18,971.55x = 28,457.33 × 9,108.45
  4. Step 4: Simplify right side
    18,971.55x = 259,202,121.90
  5. Step 5: Solve for x
    x = 259,202,121.90/18,971.55
  6. Step 6: Final answer
    x = 13,662.68

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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.