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Finding the Fourth Proportional to 18,966.60, 28,447.20 and 6,487.20

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Solution

The fourth proportional to 18,966.60, 28,447.20 and 6,487.20 is: 9,729.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,966.60 : 28,447.20 = 6,487.20 : x
  2. Step 2: Convert to fraction form
    18,966.60/28,447.20 = 6,487.20/x
  3. Step 3: Cross multiply
    18,966.60x = 28,447.20 × 6,487.20
  4. Step 4: Simplify right side
    18,966.60x = 184,542,675.84
  5. Step 5: Solve for x
    x = 184,542,675.84/18,966.60
  6. Step 6: Final answer
    x = 9,729.88

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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.