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Finding the Fourth Proportional to 2,667.60, 4,000.80 and 818.40

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Solution

The fourth proportional to 2,667.60, 4,000.80 and 818.40 is: 1,227.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,667.60 : 4,000.80 = 818.40 : x
  2. Step 2: Convert to fraction form
    2,667.60/4,000.80 = 818.40/x
  3. Step 3: Cross multiply
    2,667.60x = 4,000.80 × 818.40
  4. Step 4: Simplify right side
    2,667.60x = 3,274,254.72
  5. Step 5: Solve for x
    x = 3,274,254.72/2,667.60
  6. Step 6: Final answer
    x = 1,227.42

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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.