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Finding the Fourth Proportional to 18,720.08, 28,080.12 and 6,408.08

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Solution

The fourth proportional to 18,720.08, 28,080.12 and 6,408.08 is: 9,612.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,720.08 : 28,080.12 = 6,408.08 : x
  2. Step 2: Convert to fraction form
    18,720.08/28,080.12 = 6,408.08/x
  3. Step 3: Cross multiply
    18,720.08x = 28,080.12 × 6,408.08
  4. Step 4: Simplify right side
    18,720.08x = 179,939,655.37
  5. Step 5: Solve for x
    x = 179,939,655.37/18,720.08
  6. Step 6: Final answer
    x = 9,612.12

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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.