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Finding the Fourth Proportional to 18,809.28, 28,207.44 and 7,125.84

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Solution

The fourth proportional to 18,809.28, 28,207.44 and 7,125.84 is: 10,686.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,809.28 : 28,207.44 = 7,125.84 : x
  2. Step 2: Convert to fraction form
    18,809.28/28,207.44 = 7,125.84/x
  3. Step 3: Cross multiply
    18,809.28x = 28,207.44 × 7,125.84
  4. Step 4: Simplify right side
    18,809.28x = 201,001,704.25
  5. Step 5: Solve for x
    x = 201,001,704.25/18,809.28
  6. Step 6: Final answer
    x = 10,686.31

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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.