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Finding the Fourth Proportional to 18,765.36, 28,109.04 and 8,912.40

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Solution

The fourth proportional to 18,765.36, 28,109.04 and 8,912.40 is: 13,350.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,765.36 : 28,109.04 = 8,912.40 : x
  2. Step 2: Convert to fraction form
    18,765.36/28,109.04 = 8,912.40/x
  3. Step 3: Cross multiply
    18,765.36x = 28,109.04 × 8,912.40
  4. Step 4: Simplify right side
    18,765.36x = 250,519,008.10
  5. Step 5: Solve for x
    x = 250,519,008.10/18,765.36
  6. Step 6: Final answer
    x = 13,350.08

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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.