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Finding the Fourth Proportional to 18,911.10, 28,328.42 and 9,538.08

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Solution

The fourth proportional to 18,911.10, 28,328.42 and 9,538.08 is: 14,287.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,911.10 : 28,328.42 = 9,538.08 : x
  2. Step 2: Convert to fraction form
    18,911.10/28,328.42 = 9,538.08/x
  3. Step 3: Cross multiply
    18,911.10x = 28,328.42 × 9,538.08
  4. Step 4: Simplify right side
    18,911.10x = 270,198,688.54
  5. Step 5: Solve for x
    x = 270,198,688.54/18,911.10
  6. Step 6: Final answer
    x = 14,287.84

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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.