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Finding the Fourth Proportional to 18,665.60, 27,998.40 and 12,444.80

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Solution

The fourth proportional to 18,665.60, 27,998.40 and 12,444.80 is: 18,667.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,665.60 : 27,998.40 = 12,444.80 : x
  2. Step 2: Convert to fraction form
    18,665.60/27,998.40 = 12,444.80/x
  3. Step 3: Cross multiply
    18,665.60x = 27,998.40 × 12,444.80
  4. Step 4: Simplify right side
    18,665.60x = 348,434,488.32
  5. Step 5: Solve for x
    x = 348,434,488.32/18,665.60
  6. Step 6: Final answer
    x = 18,667.20

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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.