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Finding the Fourth Proportional to 18,869.64, 28,301.20 and 5,720.12

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Solution

The fourth proportional to 18,869.64, 28,301.20 and 5,720.12 is: 8,579.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,869.64 : 28,301.20 = 5,720.12 : x
  2. Step 2: Convert to fraction form
    18,869.64/28,301.20 = 5,720.12/x
  3. Step 3: Cross multiply
    18,869.64x = 28,301.20 × 5,720.12
  4. Step 4: Simplify right side
    18,869.64x = 161,886,260.14
  5. Step 5: Solve for x
    x = 161,886,260.14/18,869.64
  6. Step 6: Final answer
    x = 8,579.19

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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.