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Finding the Fourth Proportional to 8,812.64, 13,218.72 and 3,621.92

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Solution

The fourth proportional to 8,812.64, 13,218.72 and 3,621.92 is: 5,432.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,812.64 : 13,218.72 = 3,621.92 : x
  2. Step 2: Convert to fraction form
    8,812.64/13,218.72 = 3,621.92/x
  3. Step 3: Cross multiply
    8,812.64x = 13,218.72 × 3,621.92
  4. Step 4: Simplify right side
    8,812.64x = 47,877,146.34
  5. Step 5: Solve for x
    x = 47,877,146.34/8,812.64
  6. Step 6: Final answer
    x = 5,432.78

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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.