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Finding the Fourth Proportional to 18,978.01, 28,447.96 and 6,489.49

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Solution

The fourth proportional to 18,978.01, 28,447.96 and 6,489.49 is: 9,727.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978.01 : 28,447.96 = 6,489.49 : x
  2. Step 2: Convert to fraction form
    18,978.01/28,447.96 = 6,489.49/x
  3. Step 3: Cross multiply
    18,978.01x = 28,447.96 × 6,489.49
  4. Step 4: Simplify right side
    18,978.01x = 184,612,719.49
  5. Step 5: Solve for x
    x = 184,612,719.49/18,978.01
  6. Step 6: Final answer
    x = 9,727.72

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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.